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ARM: cpuidle: Refactor rollback operations if init fails 

If init fails, we need execute two levels rollback operations: the first
level is for the failed CPU rollback operations, the second level is to
iterate all succeeded CPUs to cancel their registration; currently the
code uses one function to finish these two levels rollback operations.

This commit is to refactor rollback operations, so it adds a new
function arm_idle_init_cpu() to encapsulate one specified CPU driver
registration and rollback the first level operations; and use function
arm_idle_init() to iterate all CPUs and finish the second level's
rollback operations.

Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Leo Yan 2017-10-10 13:47:56 +08:00 committed by Rafael J. Wysocki
parent 0f87855d96
commit 7943bfaeb6
1 changed files with 75 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

131
drivers/cpuidle/cpuidle-arm.c
View File

@ -72,79 +72,74 @@ static const struct of_device_id arm_idle_state_match[] __initconst = {
};
/*
* arm_idle_init
* arm_idle_init_cpu
*
* Registers the arm specific cpuidle driver with the cpuidle
* framework. It relies on core code to parse the idle states
* and initialize them using driver data structures accordingly.
*/
static int __init arm_idle_init(void)
static int __init arm_idle_init_cpu(int cpu)
{
int cpu, ret;
int ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
for_each_possible_cpu(cpu) {
drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv)
return -ENOMEM;
drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv) {
ret = -ENOMEM;
goto out_fail;
}
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
drv->cpumask = (struct cpumask *)cpumask_of(cpu);
/*
* Initialize idle states data, starting at index 1. This
* driver is DT only, if no DT idle states are detected (ret
* == 0) let the driver initialization fail accordingly since
* there is no reason to initialize the idle driver if only
* wfi is supported.
*/
ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
if (ret <= 0) {
ret = ret ? : -ENODEV;
goto out_kfree_drv;
}
/*
* Initialize idle states data, starting at index 1. This
* driver is DT only, if no DT idle states are detected (ret
* == 0) let the driver initialization fail accordingly since
* there is no reason to initialize the idle driver if only
* wfi is supported.
*/
ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
if (ret <= 0) {
ret = ret ? : -ENODEV;
goto out_kfree_drv;
}
ret = cpuidle_register_driver(drv);
if (ret) {
pr_err("Failed to register cpuidle driver\n");
goto out_kfree_drv;
}
ret = cpuidle_register_driver(drv);
if (ret) {
pr_err("Failed to register cpuidle driver\n");
goto out_kfree_drv;
}
/*
* Call arch CPU operations in order to initialize
* idle states suspend back-end specific data
*/
ret = arm_cpuidle_init(cpu);
/*
* Call arch CPU operations in order to initialize
* idle states suspend back-end specific data
*/
ret = arm_cpuidle_init(cpu);
/*
* Skip the cpuidle device initialization if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
*/
if (ret == -ENXIO)
return 0;
/*
* Skip the cpuidle device initialization if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
*/
if (ret == -ENXIO)
continue;
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
goto out_unregister_drv;
}
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
goto out_unregister_drv;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
pr_err("Failed to allocate cpuidle device\n");
ret = -ENOMEM;
goto out_unregister_drv;
}
dev->cpu = cpu;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
pr_err("Failed to allocate cpuidle device\n");
ret = -ENOMEM;
goto out_unregister_drv;
}
dev->cpu = cpu;
ret = cpuidle_register_device(dev);
if (ret) {
pr_err("Failed to register cpuidle device for CPU %d\n",
cpu);
goto out_kfree_dev;
}
ret = cpuidle_register_device(dev);
if (ret) {
pr_err("Failed to register cpuidle device for CPU %d\n",
cpu);
goto out_kfree_dev;
}
return 0;
@ -155,6 +150,30 @@ out_unregister_drv:
cpuidle_unregister_driver(drv);
out_kfree_drv:
kfree(drv);
return ret;
}
/*
* arm_idle_init - Initializes arm cpuidle driver
*
* Initializes arm cpuidle driver for all CPUs, if any CPU fails
* to register cpuidle driver then rollback to cancel all CPUs
* registeration.
*/
static int __init arm_idle_init(void)
{
int cpu, ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
for_each_possible_cpu(cpu) {
ret = arm_idle_init_cpu(cpu);
if (ret)
goto out_fail;
}
return 0;
out_fail:
while (--cpu >= 0) {
dev = per_cpu(cpuidle_devices, cpu);