Messages in this thread | | | From | Sia Jee Heng <> | Subject | [PATCH v4 0/4] RISC-V Hibernation Support | Date | Tue, 21 Feb 2023 10:35:19 +0800 |
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This series adds RISC-V Hibernation/suspend to disk support. Low level Arch functions were created to support hibernation. swsusp_arch_suspend() relies code from __cpu_suspend_enter() to write cpu state onto the stack, then calling swsusp_save() to save the memory image.
Arch specific hibernation header is implemented and is utilized by the arch_hibernation_header_restore() and arch_hibernation_header_save() functions. The arch specific hibernation header consists of satp, hartid, and the cpu_resume address. The kernel built version is also need to be saved into the hibernation image header to making sure only the same kernel is restore when resume.
swsusp_arch_resume() creates a temporary page table that covering only the linear map. It copies the restore code to a 'safe' page, then start to restore the memory image. Once completed, it restores the original kernel's page table. It then calls into __hibernate_cpu_resume() to restore the CPU context. Finally, it follows the normal hibernation path back to the hibernation core.
To enable hibernation/suspend to disk into RISCV, the below config need to be enabled: - CONFIG_ARCH_HIBERNATION_HEADER - CONFIG_ARCH_HIBERNATION_POSSIBLE
At high-level, this series includes the following changes: 1) Change suspend_save_csrs() and suspend_restore_csrs() to public function as these functions are common to suspend/hibernation. (patch 1) 2) Refactor the common code in the __cpu_resume_enter() function and __hibernate_cpu_resume() function. The common code are used by hibernation and suspend. (patch 2) 3) Enhance kernel_page_present() function to support huge page. (patch 3) 4) Add arch/riscv low level functions to support hibernation/suspend to disk. (patch 4)
The above patches are based on kernel v6.2 and are tested on StarFive VF2 SBC board and Qemu. ACPI platform mode is not supported in this series.
Changes since v3: - Rebased to kernel v6.2 - Temporary page table code refactoring by reference to ARM64 - Resolved typo(s) and grammars - Resolved documentation errors - Resolved clang build issue - Removed unnecessary comments - Used kzalloc instead of kcalloc
Changes since v2: - Rebased to kernel v6.2-rc5 - Refactor the common code used by hibernation and suspend - Create copy_page macro - Solved other comments from Andrew and Conor
Changes since v1: - Rebased to kernel v6.2-rc3 - Fixed bot's compilation error
Sia Jee Heng (4): RISC-V: Change suspend_save_csrs and suspend_restore_csrs to public function RISC-V: Factor out common code of __cpu_resume_enter() RISC-V: mm: Enable huge page support to kernel_page_present() function RISC-V: Add arch functions to support hibernation/suspend-to-disk
arch/riscv/Kconfig | 7 + arch/riscv/include/asm/assembler.h | 82 ++++++ arch/riscv/include/asm/suspend.h | 22 ++ arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/asm-offsets.c | 5 + arch/riscv/kernel/hibernate-asm.S | 77 +++++ arch/riscv/kernel/hibernate.c | 447 +++++++++++++++++++++++++++++ arch/riscv/kernel/suspend.c | 4 +- arch/riscv/kernel/suspend_entry.S | 34 +-- arch/riscv/mm/pageattr.c | 8 + 10 files changed, 654 insertions(+), 33 deletions(-) create mode 100644 arch/riscv/include/asm/assembler.h create mode 100644 arch/riscv/kernel/hibernate-asm.S create mode 100644 arch/riscv/kernel/hibernate.c
base-commit: db77b8502a4071a59c9424d95f87fe20bdb52c3a -- 2.34.1
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