From: Will Deacon <will@kernel.org> To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Peter Zijlstra <peterz@infradead.org>, Morten Rasmussen <morten.rasmussen@arm.com>, Qais Yousef <qais.yousef@arm.com>, Suren Baghdasaryan <surenb@google.com>, Quentin Perret <qperret@google.com>, Tejun Heo <tj@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Daniel Bristot de Oliveira <bristot@redhat.com>, kernel-team@android.com Subject: [PATCH v7 06/22] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Date: Tue, 25 May 2021 16:14:16 +0100 [thread overview] Message-ID: <20210525151432.16875-7-will@kernel.org> (raw) In-Reply-To: <20210525151432.16875-1-will@kernel.org> Since 32-bit applications will be killed if they are caught trying to execute on a 64-bit-only CPU in a mismatched system, advertise the set of 32-bit capable CPUs to userspace in sysfs. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org> --- .../ABI/testing/sysfs-devices-system-cpu | 9 +++++++++ arch/arm64/kernel/cpufeature.c | 19 +++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index fe13baa53c59..899377b2715a 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -494,6 +494,15 @@ Description: AArch64 CPU registers 'identification' directory exposes the CPU ID registers for identifying model and revision of the CPU. +What: /sys/devices/system/cpu/aarch32_el0 +Date: May 2021 +Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org> +Description: Identifies the subset of CPUs in the system that can execute + AArch32 (32-bit ARM) applications. If present, the same format as + /sys/devices/system/cpu/{offline,online,possible,present} is used. + If absent, then all or none of the CPUs can execute AArch32 + applications and execve() will behave accordingly. + What: /sys/devices/system/cpu/cpu#/cpu_capacity Date: December 2016 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4194a47de62d..959442f76ed7 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -67,6 +67,7 @@ #include <linux/crash_dump.h> #include <linux/sort.h> #include <linux/stop_machine.h> +#include <linux/sysfs.h> #include <linux/types.h> #include <linux/minmax.h> #include <linux/mm.h> @@ -1297,6 +1298,24 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static ssize_t aarch32_el0_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct cpumask *mask = system_32bit_el0_cpumask(); + + return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(mask)); +} +static const DEVICE_ATTR_RO(aarch32_el0); + +static int __init aarch32_el0_sysfs_init(void) +{ + if (!allow_mismatched_32bit_el0) + return 0; + + return device_create_file(cpu_subsys.dev_root, &dev_attr_aarch32_el0); +} +device_initcall(aarch32_el0_sysfs_init); + static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope) { if (!has_cpuid_feature(entry, scope)) -- 2.31.1.818.g46aad6cb9e-goog
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org> To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Peter Zijlstra <peterz@infradead.org>, Morten Rasmussen <morten.rasmussen@arm.com>, Qais Yousef <qais.yousef@arm.com>, Suren Baghdasaryan <surenb@google.com>, Quentin Perret <qperret@google.com>, Tejun Heo <tj@kernel.org>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Dietmar Eggemann <dietmar.eggemann@arm.com>, Daniel Bristot de Oliveira <bristot@redhat.com>, kernel-team@android.com Subject: [PATCH v7 06/22] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Date: Tue, 25 May 2021 16:14:16 +0100 [thread overview] Message-ID: <20210525151432.16875-7-will@kernel.org> (raw) In-Reply-To: <20210525151432.16875-1-will@kernel.org> Since 32-bit applications will be killed if they are caught trying to execute on a 64-bit-only CPU in a mismatched system, advertise the set of 32-bit capable CPUs to userspace in sysfs. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org> --- .../ABI/testing/sysfs-devices-system-cpu | 9 +++++++++ arch/arm64/kernel/cpufeature.c | 19 +++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index fe13baa53c59..899377b2715a 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -494,6 +494,15 @@ Description: AArch64 CPU registers 'identification' directory exposes the CPU ID registers for identifying model and revision of the CPU. +What: /sys/devices/system/cpu/aarch32_el0 +Date: May 2021 +Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org> +Description: Identifies the subset of CPUs in the system that can execute + AArch32 (32-bit ARM) applications. If present, the same format as + /sys/devices/system/cpu/{offline,online,possible,present} is used. + If absent, then all or none of the CPUs can execute AArch32 + applications and execve() will behave accordingly. + What: /sys/devices/system/cpu/cpu#/cpu_capacity Date: December 2016 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4194a47de62d..959442f76ed7 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -67,6 +67,7 @@ #include <linux/crash_dump.h> #include <linux/sort.h> #include <linux/stop_machine.h> +#include <linux/sysfs.h> #include <linux/types.h> #include <linux/minmax.h> #include <linux/mm.h> @@ -1297,6 +1298,24 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static ssize_t aarch32_el0_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct cpumask *mask = system_32bit_el0_cpumask(); + + return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(mask)); +} +static const DEVICE_ATTR_RO(aarch32_el0); + +static int __init aarch32_el0_sysfs_init(void) +{ + if (!allow_mismatched_32bit_el0) + return 0; + + return device_create_file(cpu_subsys.dev_root, &dev_attr_aarch32_el0); +} +device_initcall(aarch32_el0_sysfs_init); + static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope) { if (!has_cpuid_feature(entry, scope)) -- 2.31.1.818.g46aad6cb9e-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-05-25 15:15 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-25 15:14 [PATCH v7 00/22] Add support for 32-bit tasks on asymmetric AArch32 systems Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 01/22] sched: Favour predetermined active CPU as migration destination Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-26 11:14 ` Valentin Schneider 2021-05-26 11:14 ` Valentin Schneider 2021-05-26 12:32 ` Peter Zijlstra 2021-05-26 12:32 ` Peter Zijlstra 2021-05-26 12:36 ` Valentin Schneider 2021-05-26 12:36 ` Valentin Schneider 2021-05-26 16:03 ` Will Deacon 2021-05-26 16:03 ` Will Deacon 2021-05-26 17:46 ` Valentin Schneider 2021-05-26 17:46 ` Valentin Schneider 2021-05-25 15:14 ` [PATCH v7 02/22] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 03/22] arm64: Allow mismatched 32-bit EL0 support Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 04/22] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 05/22] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` Will Deacon [this message] 2021-05-25 15:14 ` [PATCH v7 06/22] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon 2021-05-25 15:14 ` [PATCH v7 07/22] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 08/22] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-26 15:02 ` Peter Zijlstra 2021-05-26 15:02 ` Peter Zijlstra 2021-05-26 16:07 ` Will Deacon 2021-05-26 16:07 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 09/22] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 10/22] sched: Reject CPU affinity changes based on task_cpu_possible_mask() Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-26 15:15 ` Peter Zijlstra 2021-05-26 15:15 ` Peter Zijlstra 2021-05-26 16:12 ` Will Deacon 2021-05-26 16:12 ` Will Deacon 2021-05-26 17:56 ` Peter Zijlstra 2021-05-26 17:56 ` Peter Zijlstra 2021-05-26 18:59 ` Will Deacon 2021-05-26 18:59 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 11/22] sched: Introduce task_struct::user_cpus_ptr to track requested affinity Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 12/22] sched: Split the guts of sched_setaffinity() into a helper function Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 13/22] sched: Allow task CPU affinity to be restricted on asymmetric systems Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-26 16:20 ` Peter Zijlstra 2021-05-26 16:20 ` Peter Zijlstra 2021-05-26 16:35 ` Will Deacon 2021-05-26 16:35 ` Will Deacon 2021-05-26 16:30 ` Peter Zijlstra 2021-05-26 16:30 ` Peter Zijlstra 2021-05-26 17:02 ` Will Deacon 2021-05-26 17:02 ` Will Deacon 2021-05-27 7:56 ` Peter Zijlstra 2021-05-27 7:56 ` Peter Zijlstra 2021-05-25 15:14 ` [PATCH v7 14/22] sched: Introduce task_cpus_dl_admissible() to check proposed affinity Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 15/22] freezer: Add frozen_or_skipped() helper function Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 16/22] sched: Defer wakeup in ttwu() for unschedulable frozen tasks Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-27 14:10 ` Peter Zijlstra 2021-05-27 14:10 ` Peter Zijlstra 2021-05-27 14:31 ` Peter Zijlstra 2021-05-27 14:31 ` Peter Zijlstra 2021-05-27 14:44 ` Will Deacon 2021-05-27 14:44 ` Will Deacon 2021-05-27 14:55 ` Peter Zijlstra 2021-05-27 14:55 ` Peter Zijlstra 2021-05-27 14:50 ` Peter Zijlstra 2021-05-27 14:50 ` Peter Zijlstra 2021-05-28 10:49 ` Peter Zijlstra 2021-05-28 10:49 ` Peter Zijlstra 2021-05-27 14:36 ` Will Deacon 2021-05-27 14:36 ` Will Deacon 2021-06-01 8:21 ` [RFC][PATCH] freezer,sched: Rewrite core freezer logic Peter Zijlstra 2021-06-01 8:21 ` Peter Zijlstra 2021-06-01 11:27 ` Peter Zijlstra 2021-06-01 11:27 ` Peter Zijlstra 2021-06-02 12:54 ` Will Deacon 2021-06-02 12:54 ` Will Deacon 2021-06-03 10:35 ` Peter Zijlstra 2021-06-03 10:35 ` Peter Zijlstra 2021-06-03 10:58 ` Will Deacon 2021-06-03 10:58 ` Will Deacon 2021-06-03 11:26 ` Peter Zijlstra 2021-06-03 11:26 ` Peter Zijlstra 2021-06-03 11:36 ` Will Deacon 2021-06-03 11:36 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 17/22] arm64: Implement task_cpu_possible_mask() Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 18/22] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 19/22] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 20/22] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 21/22] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 15:14 ` [PATCH v7 22/22] Documentation: arm64: describe asymmetric 32-bit support Will Deacon 2021-05-25 15:14 ` Will Deacon 2021-05-25 17:13 ` Marc Zyngier 2021-05-25 17:13 ` Marc Zyngier 2021-05-25 17:27 ` Will Deacon 2021-05-25 17:27 ` Will Deacon 2021-05-25 18:11 ` Marc Zyngier 2021-05-25 18:11 ` Marc Zyngier 2021-05-26 16:00 ` Will Deacon 2021-05-26 16:00 ` Will Deacon
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