From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v4 10/13] firmware: arm_sdei: Add support for CPU and system power states
Date: Wed, 18 Oct 2017 18:17:47 +0100 [thread overview]
Message-ID: <20171018171747.GI21820@arm.com> (raw)
In-Reply-To: <20171017174432.1684-11-james.morse@arm.com>
On Tue, Oct 17, 2017 at 06:44:29PM +0100, James Morse wrote:
> When a CPU enters an idle lower-power state or is powering off, we
> need to mask SDE events so that no events can be delivered while we
> are messing with the MMU as the registered entry points won't be valid.
>
> If the system reboots, we want to unregister all events and mask the CPUs.
> For kexec this allows us to hand a clean slate to the next kernel
> instead of relying on it to call sdei_{private,system}_data_reset().
>
> For hibernate we unregister all events and re-register them on restore,
> in case we restored with the SDE code loaded at a different address.
> (e.g. KASLR).
>
> Add all the notifiers necessary to do this. We only support shared events
> so all events are left registered and enabled over CPU hotplug.
>
> Signed-off-by: James Morse <james.morse@arm•com>
>
> ---
> Changes since v3:
> * Renamed CPUHP enum entry to have an ARM_ prefix.
>
> drivers/firmware/arm_sdei.c | 228 +++++++++++++++++++++++++++++++++++++++++++-
> include/linux/arm_sdei.h | 3 +
> include/linux/cpuhotplug.h | 1 +
> 3 files changed, 231 insertions(+), 1 deletion(-)
[...]
> static void sdei_smccc_smc(unsigned long function_id,
> unsigned long arg0, unsigned long arg1,
> unsigned long arg2, unsigned long arg3,
> @@ -544,9 +742,36 @@ static int sdei_probe(struct platform_device *pdev)
> return 0;
> }
>
> + err = cpuhp_setup_state_nocalls(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
> + &sdei_cpuhp_up, &sdei_cpuhp_down);
> + if (err) {
> + pr_warn("Failed to register CPU hotplug notifier...\n");
> + return err;
> + }
What prevents CPU hotplug events coming in here?
Will
next prev parent reply other threads:[~2017-10-18 17:17 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-17 17:44 [PATCH v4 00/13] arm64/firmware: Software Delegated Exception Interface James Morse
2017-10-17 17:44 ` [PATCH v4 01/13] KVM: arm64: Store vcpu on the stack during __guest_enter() James Morse
2017-10-17 17:44 ` [PATCH v4 02/13] KVM: arm/arm64: Convert kvm_host_cpu_state to a static per-cpu allocation James Morse
2017-10-17 17:44 ` [PATCH v4 03/13] KVM: arm64: Change hyp_panic()s dependency on tpidr_el2 James Morse
2017-10-17 17:44 ` [PATCH v4 04/13] arm64: alternatives: use tpidr_el2 on VHE hosts James Morse
2017-10-18 11:00 ` Catalin Marinas
2017-10-17 17:44 ` [PATCH v4 05/13] KVM: arm64: Stop save/restoring host tpidr_el1 on VHE James Morse
2017-10-17 17:44 ` [PATCH v4 06/13] Docs: dt: add devicetree binding for describing arm64 SDEI firmware James Morse
2017-10-17 17:44 ` [PATCH v4 07/13] firmware: arm_sdei: Add driver for Software Delegated Exceptions James Morse
2017-10-18 11:09 ` Catalin Marinas
2017-10-17 17:44 ` [PATCH v4 08/13] arm64: Add vmap_stack header file James Morse
2017-10-18 11:10 ` Catalin Marinas
2017-10-17 17:44 ` [PATCH v4 09/13] arm64: kernel: Add arch-specific SDEI entry code and CPU masking James Morse
2017-10-18 11:18 ` Catalin Marinas
2017-10-17 17:44 ` [PATCH v4 10/13] firmware: arm_sdei: Add support for CPU and system power states James Morse
2017-10-18 11:11 ` Catalin Marinas
2017-10-18 17:17 ` Will Deacon [this message]
2017-10-24 17:34 ` James Morse
2017-10-25 14:43 ` Will Deacon
2017-10-17 17:44 ` [PATCH v4 11/13] firmware: arm_sdei: add support for CPU private events James Morse
2017-10-18 11:11 ` Catalin Marinas
2017-10-18 17:19 ` Will Deacon
2017-10-24 17:34 ` James Morse
2017-11-01 15:59 ` James Morse
2017-10-17 17:44 ` [PATCH v4 12/13] arm64: acpi: Remove __init from acpi_psci_use_hvc() for use by SDEI James Morse
2017-10-18 11:11 ` Catalin Marinas
2017-10-17 17:44 ` [PATCH v4 13/13] firmware: arm_sdei: Discover SDEI support via ACPI James Morse
2017-10-18 11:12 ` Catalin Marinas
2017-10-18 17:16 ` [PATCH v4 00/13] arm64/firmware: Software Delegated Exception Interface Will Deacon
2017-10-30 15:58 ` [PATCH v4 14/13] firmware: arm_sdei: Move cpuhotplug registration later James Morse
2017-11-01 15:59 ` [PATCH 15/13] firmware: arm_sdei: move the frozen flag under the spinlock James Morse
2017-11-08 15:11 ` James Morse
2017-11-08 16:06 ` [PATCH v4 15/13] firmware: arm_sdei: be more robust against cpu-hotplug James Morse
2017-11-13 11:01 ` Will Deacon
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