Merge "arm64: kernel: implement fpsimd CPU PM notifier" (9db54d93) · Commits · e / devices / android_kernel_sony_msm8994_rework

arch/arm64/kernel/fpsimd.c

+36 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		* along with this program. If not, see <http://www.gnu.org/licenses/>.
		*/

		#include <linux/cpu_pm.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/sched.h>
		@@ -83,6 +84,39 @@ void fpsimd_flush_thread(void)
		fpsimd_load_state(&current->thread.fpsimd_state);
		}

		#ifdef CONFIG_CPU_PM
		static int fpsimd_cpu_pm_notifier(struct notifier_block *self,
		unsigned long cmd, void *v)
		{
		switch (cmd) {
		case CPU_PM_ENTER:
		if (current->mm)
		fpsimd_save_state(&current->thread.fpsimd_state);
		break;
		case CPU_PM_EXIT:
		if (current->mm)
		fpsimd_load_state(&current->thread.fpsimd_state);
		break;
		case CPU_PM_ENTER_FAILED:
		default:
		return NOTIFY_DONE;
		}
		return NOTIFY_OK;
		}

		static struct notifier_block fpsimd_cpu_pm_notifier_block = {
		.notifier_call = fpsimd_cpu_pm_notifier,
		};

		static void fpsimd_pm_init(void)
		{
		cpu_pm_register_notifier(&fpsimd_cpu_pm_notifier_block);
		}

		#else
		static inline void fpsimd_pm_init(void) { }
		#endif /* CONFIG_CPU_PM */

		/*
		* FP/SIMD support code initialisation.
		*/
		@@ -101,6 +135,8 @@ static int __init fpsimd_init(void)
		else
		elf_hwcap \|= HWCAP_ASIMD;

		fpsimd_pm_init();

		return 0;
		}
		late_initcall(fpsimd_init);