From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Fri, 11 Oct 2013 19:24:00 +0100 Subject: [PATCHv4 0/6] arm64: initial CPU hotplug support Message-ID: <1381515846-1684-1-git-send-email-mark.rutland@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The following patches add basic HOTPLUG_CPU support to arm64, which combined with appropriate firmware (e.g. [1]) can be used to power CPUs up and down dynamically. I've tested this series with the bootwrapper PSCI implementation I've placed on linux-arm.org [1] and a modified foundation model dts with a psci node and each CPU's enable-method set to "psci", using a shell while repeatedly cycling all cpus off and on: for C in $(seq 0 3); do ./cyclichotplug.sh $C& done ---->8---- #!/bin/sh # cyclichotplug.sh CPU=$1; if [ -z "$CPU" ]; then printf "Usage: $0 \n"; exit 1; fi ONLINEFILE=/sys/devices/system/cpu/cpu$CPU/online; while true; do echo 0 > $ONLINEFILE; sleep 0.0$RANDOM; echo 1 > $ONLINEFILE; done ---->8---- Nico, Santosh, Due to rearranging smp_operations to cpu_operations, I've dropped the Acks you provided for v3. Other than the changes to accomodate this or the logical consequences (folding smp_psci.c and psci.c) I hope I haven't made too major a change to not be Ack-worthy again :) Thanks, Mark. Since v1 [2]: * Rebased to v3.11-rc2 to solve cpuinit removal conflicts. * Removed failure path for cpu_die, it causes more problems than it solves. * Removed cpu_kill, we don't currently need it. * Test for cpu_die in op_cpu_disable to fail early and survive when there's no mechanism for hot unplug. * Change pr_err on failed cpu_die to a pr_crit. * Removed dependency on HOTPLUG, which has been obliterated. Since v2 [3]: * Rebased to v3.11-rc4 to prevent clash with Xen [4]. * Added proper kerneldoc comments to smp_operations. * Removed harmful RCU_NONIDLE from cpu_die as per arm implementation (aa03381046: ARM: smp: Drop RCU_NONIDLE usage in cpu_die()). * Expanded cpu_die comments. * Added missing newline to pr_crit in smp_psci_cpu_die(). Since v3 [5]: * Rebased all the way to v3.12-rc4 * Split cpu_operations from SMP, per Catalin's comments. * Read CPU0's enable-method even on UP kernels. * Folded smp_psci.c into psci.c. * Updated test scripts per Nico's comments. [1] http://linux-arm.org/git?p=boot-wrapper-aarch64.git;a=shortlog;h=refs/heads/psci [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/182880.html [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/185351.html [4] http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/185437.html [5] http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/192091.html Mark Rutland (6): arm64: unify smp_psci.c and psci.c arm64: reorganise smp_enable_ops arm64: factor out spin-table boot method arm64: add CPU_HOTPLUG infrastructure arm64: add PSCI CPU_OFF-based hotplug support arm64: read enable-method for CPU0 arch/arm64/Kconfig | 7 ++ arch/arm64/include/asm/cpu_ops.h | 59 +++++++++++ arch/arm64/include/asm/irq.h | 1 + arch/arm64/include/asm/psci.h | 19 ---- arch/arm64/include/asm/smp.h | 15 +-- arch/arm64/kernel/Makefile | 4 +- arch/arm64/kernel/cpu_ops.c | 94 +++++++++++++++++ arch/arm64/kernel/cputable.c | 2 +- arch/arm64/kernel/head.S | 12 ++- arch/arm64/kernel/irq.c | 61 +++++++++++ arch/arm64/kernel/process.c | 7 ++ arch/arm64/kernel/psci.c | 87 ++++++++++++++- arch/arm64/kernel/setup.c | 2 + arch/arm64/kernel/smp.c | 209 +++++++++++++++++++------------------ arch/arm64/kernel/smp_psci.c | 53 ---------- arch/arm64/kernel/smp_spin_table.c | 86 ++++++++++++++- arch/arm64/kernel/vmlinux.lds.S | 1 - 17 files changed, 522 insertions(+), 197 deletions(-) create mode 100644 arch/arm64/include/asm/cpu_ops.h create mode 100644 arch/arm64/kernel/cpu_ops.c delete mode 100644 arch/arm64/kernel/smp_psci.c -- 1.8.1.1