| Message ID | 20230106113216.443057-1-ajones@ventanamicro.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | riscv: Introduce system suspend support | expand |
Hey Drew! On Fri, Jan 06, 2023 at 12:32:15PM +0100, Andrew Jones wrote: > Booting with an OpenSBI including the RFC series[1] implementing the > draft proposal for SBI system suspend[2] we can add system support to > Linux. This support implements "suspend-to-RAM", which means when a > kernel is built with CONFIG_SUSPEND 'echo mem > /sys/power/state' will > initiate a suspension. > > This has only been tested on QEMU using the OpenSBI system suspend > test. The test just waits 5 seconds and then resumes. To truly use > system suspend a platform must have a low-level firmware implementation > and provide at least one wake-up event, such as from a wakeup-capable > RTC alarm, to resume. > > [1] https://github.com/jones-drew/opensbi/commits/susp-rfc > Posting: http://lists.infradead.org/pipermail/opensbi/2023-January/004091.html > [2] https://github.com/jones-drew/riscv-sbi-doc/commit/d9e43e9a938fc3eb510e023c3f352462876f7785 In case you don't get alerts from GH, I left one *tiny* comment on this. And I really mean tiny! Thanks, Conor.
On Tue, Jan 17, 2023 at 10:34:59PM +0000, Conor Dooley wrote: > Hey Drew! > > On Fri, Jan 06, 2023 at 12:32:15PM +0100, Andrew Jones wrote: > > Booting with an OpenSBI including the RFC series[1] implementing the > > draft proposal for SBI system suspend[2] we can add system support to > > Linux. This support implements "suspend-to-RAM", which means when a > > kernel is built with CONFIG_SUSPEND 'echo mem > /sys/power/state' will > > initiate a suspension. > > > > This has only been tested on QEMU using the OpenSBI system suspend > > test. The test just waits 5 seconds and then resumes. To truly use > > system suspend a platform must have a low-level firmware implementation > > and provide at least one wake-up event, such as from a wakeup-capable > > RTC alarm, to resume. > > > > [1] https://github.com/jones-drew/opensbi/commits/susp-rfc > > Posting: http://lists.infradead.org/pipermail/opensbi/2023-January/004091.html > > [2] https://github.com/jones-drew/riscv-sbi-doc/commit/d9e43e9a938fc3eb510e023c3f352462876f7785 > > In case you don't get alerts from GH, I left one *tiny* comment on this. > And I really mean tiny! Hi Conor, Yup, I saw the comma suggestion and agree with it. As there are two other instances of that error description in the spec I'll also send a PR to add commas to them as well. Thanks, drew
Booting with an OpenSBI including the RFC series[1] implementing the draft proposal for SBI system suspend[2] we can add system support to Linux. This support implements "suspend-to-RAM", which means when a kernel is built with CONFIG_SUSPEND 'echo mem > /sys/power/state' will initiate a suspension. This has only been tested on QEMU using the OpenSBI system suspend test. The test just waits 5 seconds and then resumes. To truly use system suspend a platform must have a low-level firmware implementation and provide at least one wake-up event, such as from a wakeup-capable RTC alarm, to resume. [1] https://github.com/jones-drew/opensbi/commits/susp-rfc Posting: http://lists.infradead.org/pipermail/opensbi/2023-January/004091.html [2] https://github.com/jones-drew/riscv-sbi-doc/commit/d9e43e9a938fc3eb510e023c3f352462876f7785 Posting: https://lists.riscv.org/g/tech-prs/message/75 This patch is also available at https://github.com/jones-drew/linux/commits/riscv/sbi-susp-rfc Andrew Jones (1): riscv: sbi: Introduce system suspend support arch/riscv/Kconfig | 5 ++++- arch/riscv/include/asm/sbi.h | 9 ++++++++ arch/riscv/kernel/suspend.c | 41 ++++++++++++++++++++++++++++++++++++ 3 files changed, 54 insertions(+), 1 deletion(-)