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author | Max Filippov <jcmvbkbc@gmail.com> | 2022-04-20 06:07:20 -0700 |
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committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-01 19:51:24 -0700 |
commit | 733f5c28e59ef23fef9e0b64d79df24c2a4eed2b (patch) | |
tree | 244e980beca10ef1fd22ae44b2f04e33d4ccb9a7 /arch/xtensa/kernel/hibernate.c | |
parent | 11e969bc964a0e50ae64cdba092048e3937d2389 (diff) | |
download | linux-733f5c28e59ef23fef9e0b64d79df24c2a4eed2b.tar.gz linux-733f5c28e59ef23fef9e0b64d79df24c2a4eed2b.tar.bz2 linux-733f5c28e59ef23fef9e0b64d79df24c2a4eed2b.zip |
xtensa: add hibernation support
Define ARCH_HIBERNATION_POSSIBLE in Kconfig and implement hibernation
callbacks.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/hibernate.c')
-rw-r--r-- | arch/xtensa/kernel/hibernate.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/hibernate.c b/arch/xtensa/kernel/hibernate.c new file mode 100644 index 000000000000..06984327d6e2 --- /dev/null +++ b/arch/xtensa/kernel/hibernate.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/mm.h> +#include <linux/suspend.h> +#include <asm/coprocessor.h> + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin)); + unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end)); + + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); +} + +void notrace save_processor_state(void) +{ + WARN_ON(num_online_cpus() != 1); +#if XTENSA_HAVE_COPROCESSORS + local_coprocessors_flush_release_all(); +#endif +} + +void notrace restore_processor_state(void) +{ +} |