]> git.karo-electronics.de Git - linux-beck.git/commit
arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va
authorJames Morse <james.morse@arm.com>
Wed, 27 Apr 2016 16:47:07 +0000 (17:47 +0100)
committerWill Deacon <will.deacon@arm.com>
Thu, 28 Apr 2016 11:05:46 +0000 (12:05 +0100)
commitcabe1c81ea5be983425d117912d7883e252a3b09
treefdaffa85d67177412f944da52ec2443c5d432c6c
parentadc9b2dfd00924e9e9b98613f36a6cb8c51f0dc6
arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va

By enabling the MMU early in cpu_resume(), the sleep_save_sp and stack can
be accessed by VA, which avoids the need to convert-addresses and clean to
PoC on the suspend path.

MMU setup is shared with the boot path, meaning the swapper_pg_dir is
restored directly: ttbr1_el1 is no longer saved/restored.

struct sleep_save_sp is removed, replacing it with a single array of
pointers.

cpu_do_{suspend,resume} could be further reduced to not restore: cpacr_el1,
mdscr_el1, tcr_el1, vbar_el1 and sctlr_el1, all of which are set by
__cpu_setup(). However these values all contain res0 bits that may be used
to enable future features.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/include/asm/suspend.h
arch/arm64/kernel/asm-offsets.c
arch/arm64/kernel/head.S
arch/arm64/kernel/setup.c
arch/arm64/kernel/sleep.S
arch/arm64/kernel/suspend.c
arch/arm64/mm/proc.S