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authorLeo Yan <leo.yan@linaro.org>2017-10-10 08:47:56 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-14 02:01:11 +0300
commit7943bfaeb6bbbf595df4bd4087f5b890761c4898 (patch)
tree33bc6cbc6f66778cf4445363520813346983827e /drivers/cpuidle
parent0f87855d969a87f02048ff5ced7503465d5ab2f1 (diff)
downloadlinux-7943bfaeb6bbbf595df4bd4087f5b890761c4898.tar.xz
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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-arm.c145
1 files changed, 82 insertions, 63 deletions
diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index f47c54546752..ddee1b601b89 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -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);
-
- /*
- * 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;
- }
-
- /*
- * 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)
- continue;
-
- 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;
-
- ret = cpuidle_register_device(dev);
- if (ret) {
- pr_err("Failed to register cpuidle device for CPU %d\n",
- cpu);
- goto out_kfree_dev;
- }
+ 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;
+ }
+
+ 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);
+
+ /*
+ * Skip the cpuidle device initialization if the reported
+ * failure is a HW misconfiguration/breakage (-ENXIO).
+ */
+ if (ret == -ENXIO)
+ return 0;
+
+ 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;
+
+ 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);