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ARM64_CPU_SUSPEND config option was introduced to make code providing context save/restore selectable only on platforms requiring power management capabilities. Currently ARM64_CPU_SUSPEND depends on the PM_SLEEP config option which in turn is set by the SUSPEND config option. The introduction of CPU_IDLE for arm64 requires that code configured by ARM64_CPU_SUSPEND (context save/restore) should be compiled in in order to enable the CPU idle driver to rely on CPU operations carrying out context save/restore. The ARM64_CPUIDLE config option (ARM64 generic idle driver) is therefore forced to select ARM64_CPU_SUSPEND, even if there may be (ie PM_SLEEP) failed dependencies, which is not a clean way of handling the kernel configuration option. For these reasons, this patch removes the ARM64_CPU_SUSPEND config option and makes the context save/restore dependent on CPU_PM, which is selected whenever either SUSPEND or CPU_IDLE are configured, cleaning up dependencies in the process. This way, code previously configured through ARM64_CPU_SUSPEND is compiled in whenever a power management subsystem requires it to be present in the kernel (SUSPEND || CPU_IDLE), which is the behaviour expected on ARM64 kernels. The cpu_suspend and cpu_init_idle CPU operations are added only if CPU_IDLE is selected, since they are CPU_IDLE specific methods and should be grouped and defined accordingly. PSCI CPU operations are updated to reflect the introduced changes. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
/*
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* Copyright (C) 2013 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_CPU_OPS_H
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#define __ASM_CPU_OPS_H
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#include <linux/init.h>
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#include <linux/threads.h>
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struct device_node;
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/**
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* struct cpu_operations - Callback operations for hotplugging CPUs.
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*
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* @name: Name of the property as appears in a devicetree cpu node's
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* enable-method property.
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* @cpu_init: Reads any data necessary for a specific enable-method from the
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* devicetree, for a given cpu node and proposed logical id.
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* @cpu_prepare: Early one-time preparation step for a cpu. If there is a
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* mechanism for doing so, tests whether it is possible to boot
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* the given CPU.
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* @cpu_boot: Boots a cpu into the kernel.
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* @cpu_postboot: Optionally, perform any post-boot cleanup or necesary
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* synchronisation. Called from the cpu being booted.
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* @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
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* reason, which will cause the hot unplug to be aborted. Called
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* from the cpu to be killed.
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* @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the
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* cpu being killed.
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* @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu.
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* @cpu_init_idle: Reads any data necessary to initialize CPU idle states from
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* devicetree, for a given cpu node and proposed logical id.
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* @cpu_suspend: Suspends a cpu and saves the required context. May fail owing
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* to wrong parameters or error conditions. Called from the
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* CPU being suspended. Must be called with IRQs disabled.
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*/
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struct cpu_operations {
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const char *name;
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int (*cpu_init)(struct device_node *, unsigned int);
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int (*cpu_prepare)(unsigned int);
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int (*cpu_boot)(unsigned int);
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void (*cpu_postboot)(void);
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#ifdef CONFIG_HOTPLUG_CPU
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int (*cpu_disable)(unsigned int cpu);
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void (*cpu_die)(unsigned int cpu);
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int (*cpu_kill)(unsigned int cpu);
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#endif
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#ifdef CONFIG_CPU_IDLE
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int (*cpu_init_idle)(struct device_node *, unsigned int);
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int (*cpu_suspend)(unsigned long);
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#endif
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};
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extern const struct cpu_operations *cpu_ops[NR_CPUS];
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int __init cpu_read_ops(struct device_node *dn, int cpu);
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void __init cpu_read_bootcpu_ops(void);
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#endif /* ifndef __ASM_CPU_OPS_H */
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