From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Julien Thierry <julien.thierry@arm.com>,
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
Subject: Re: [PATCH v6 03/24] arm64: cpufeature: Add cpufeature for IRQ priority masking
Date: Mon, 12 Nov 2018 18:02:41 +0000 [thread overview]
Message-ID: <c17e8470-ad13-ca1d-d8aa-71feebd1a32d@arm.com> (raw)
In-Reply-To: <1542023835-21446-4-git-send-email-julien.thierry@arm.com>
On 12/11/2018 11:56, Julien Thierry wrote:
> Add a cpufeature indicating whether a cpu supports masking interrupts
> by priority.
>
> The feature will be properly enabled in a later patch.
>
> Signed-off-by: Julien Thierry <julien.thierry@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
> arch/arm64/include/asm/cpucaps.h | 3 ++-
> arch/arm64/include/asm/cpufeature.h | 6 ++++++
> arch/arm64/kernel/cpufeature.c | 23 +++++++++++++++++++++++
> 3 files changed, 31 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
> index 6e2d254..f367e5c 100644
> --- a/arch/arm64/include/asm/cpucaps.h
> +++ b/arch/arm64/include/asm/cpucaps.h
> @@ -54,7 +54,8 @@
> #define ARM64_HAS_CRC32 33
> #define ARM64_SSBS 34
> #define ARM64_WORKAROUND_1188873 35
> +#define ARM64_HAS_IRQ_PRIO_MASKING 36
>
> -#define ARM64_NCAPS 36
> +#define ARM64_NCAPS 37
>
> #endif /* __ASM_CPUCAPS_H */
> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
> index 7e2ec64..a6e063f 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -514,6 +514,12 @@ static inline bool system_supports_cnp(void)
> cpus_have_const_cap(ARM64_HAS_CNP);
> }
>
> +static inline bool system_supports_irq_prio_masking(void)
> +{
> + return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) &&
> + cpus_have_const_cap(ARM64_HAS_IRQ_PRIO_MASKING);
> +}
> +
> #define ARM64_SSBD_UNKNOWN -1
> #define ARM64_SSBD_FORCE_DISABLE 0
> #define ARM64_SSBD_KERNEL 1
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 03a9d96..1b5b553 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -1145,6 +1145,14 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
> }
> #endif /* CONFIG_ARM64_RAS_EXTN */
>
> +#ifdef CONFIG_ARM64_PSEUDO_NMI
> +static bool can_use_gic_priorities(const struct arm64_cpu_capabilities *entry,
> + int scope)
> +{
> + return false;
> +}
> +#endif
> +
> static const struct arm64_cpu_capabilities arm64_features[] = {
> {
> .desc = "GIC system register CPU interface",
> @@ -1368,6 +1376,21 @@ static void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused)
> .cpu_enable = cpu_enable_cnp,
> },
> #endif
> +#ifdef CONFIG_ARM64_PSEUDO_NMI
> + {
> + /*
> + * Depends on having GICv3
> + */
> + .desc = "IRQ priority masking",
> + .capability = ARM64_HAS_IRQ_PRIO_MASKING,
> + .type = ARM64_CPUCAP_STRICT_BOOT_CPU_FEATURE,
> + .matches = can_use_gic_priorities,
> + .sys_reg = SYS_ID_AA64PFR0_EL1,
> + .field_pos = ID_AA64PFR0_GIC_SHIFT,
> + .sign = FTR_UNSIGNED,
> + .min_field_value = 1,
> + },
> +#endif
> {},
> };
>
>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
next prev parent reply other threads:[~2018-11-12 18:02 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-12 11:56 [PATCH v6 00/24] arm64: provide pseudo NMI with GICv3 Julien Thierry
2018-11-12 11:56 ` [PATCH v6 01/24] arm64: Remove unused daif related functions/macros Julien Thierry
2018-11-29 16:26 ` Mark Rutland
2018-11-30 18:03 ` Catalin Marinas
2018-11-12 11:56 ` [PATCH v6 02/24] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Julien Thierry
2018-11-12 18:00 ` Suzuki K Poulose
2018-11-29 16:27 ` Mark Rutland
2018-11-30 18:07 ` Catalin Marinas
2018-11-12 11:56 ` [PATCH v6 03/24] arm64: cpufeature: Add cpufeature for IRQ priority masking Julien Thierry
2018-11-12 18:02 ` Suzuki K Poulose [this message]
2018-11-29 17:12 ` Mark Rutland
2018-12-03 10:33 ` Julien Thierry
2018-11-30 18:07 ` Catalin Marinas
2018-11-12 11:56 ` [PATCH v6 04/24] arm/arm64: gic-v3: Add PMR and RPR accessors Julien Thierry
2018-11-29 16:32 ` Mark Rutland
2018-11-30 18:07 ` Catalin Marinas
2018-11-12 11:56 ` [PATCH v6 05/24] irqchip/gic-v3: Switch to PMR masking before calling IRQ handler Julien Thierry
2018-11-29 18:12 ` Mark Rutland
2018-11-30 9:18 ` Julien Thierry
2018-12-04 16:21 ` Catalin Marinas
2018-11-12 11:56 ` [PATCH v6 06/24] arm64: ptrace: Provide definitions for PMR values Julien Thierry
2018-11-29 16:40 ` Mark Rutland
2018-11-30 8:53 ` Julien Thierry
2018-11-30 10:38 ` Daniel Thompson
2018-11-30 11:03 ` Julien Thierry
2018-11-12 11:56 ` [PATCH v6 07/24] arm64: Make PMR part of task context Julien Thierry
2018-11-29 16:46 ` Mark Rutland
2018-11-30 9:25 ` Julien Thierry
2018-12-04 17:09 ` Catalin Marinas
2018-12-04 17:30 ` Julien Thierry
2018-11-12 11:56 ` [PATCH v6 08/24] arm64: Unmask PMR before going idle Julien Thierry
2018-11-29 17:44 ` Mark Rutland
2018-11-30 10:55 ` Julien Thierry
2018-11-30 13:37 ` Mark Rutland
2018-12-03 10:38 ` Julien Thierry
2018-11-12 11:57 ` [PATCH v6 09/24] arm64: kvm: Unmask PMR before entering guest Julien Thierry
2018-11-12 11:57 ` [PATCH v6 10/24] arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking Julien Thierry
2018-12-04 17:36 ` Catalin Marinas
2018-12-05 16:55 ` Julien Thierry
2018-12-05 18:26 ` Catalin Marinas
2018-12-06 9:50 ` Julien Thierry
2018-12-10 14:39 ` Catalin Marinas
2018-11-12 11:57 ` [PATCH v6 11/24] arm64: daifflags: Include PMR in daifflags restore operations Julien Thierry
2018-11-12 11:57 ` [PATCH v6 12/24] arm64: alternative: Allow alternative status checking per cpufeature Julien Thierry
2018-11-12 11:57 ` [PATCH v6 13/24] arm64: alternative: Apply alternatives early in boot process Julien Thierry
2018-11-12 11:57 ` [PATCH v6 14/24] irqchip/gic-v3: Factor group0 detection into functions Julien Thierry
2018-11-12 11:57 ` [PATCH v6 15/24] arm64: Switch to PMR masking when starting CPUs Julien Thierry
2018-12-04 17:51 ` Catalin Marinas
2018-12-04 18:11 ` Julien Thierry
2018-11-12 11:57 ` [PATCH v6 16/24] arm64: gic-v3: Implement arch support for priority masking Julien Thierry
2018-11-12 11:57 ` [PATCH v6 17/24] irqchip/gic-v3: Detect if GIC can support pseudo-NMIs Julien Thierry
2018-11-12 11:57 ` [PATCH v6 18/24] irqchip/gic-v3: Handle pseudo-NMIs Julien Thierry
2018-11-12 11:57 ` [PATCH v6 19/24] irqchip/gic: Add functions to access irq priorities Julien Thierry
2018-11-12 11:57 ` [PATCH v6 20/24] irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI Julien Thierry
2018-11-12 11:57 ` [PATCH v6 21/24] arm64: Handle serror in NMI context Julien Thierry
2018-12-04 18:09 ` Catalin Marinas
2018-12-05 13:02 ` James Morse
2018-11-12 11:57 ` [PATCH v6 22/24] arm64: Skip preemption when exiting an NMI Julien Thierry
2018-11-12 11:57 ` [PATCH v6 23/24] arm64: Skip irqflags tracing for NMI in IRQs disabled context Julien Thierry
2018-11-12 11:57 ` [PATCH v6 24/24] arm64: Enable the support of pseudo-NMIs Julien Thierry
2018-11-12 12:00 ` [PATCH v6 00/24] arm64: provide pseudo NMI with GICv3 Julien Thierry
2018-11-13 14:43 ` Julien Thierry
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