[PATCH v3 0/9] HSM implementation for Allwinner D1

[Anup Patel]

On Mon, Jun 13, 2022 at 6:34 AM Samuel Holland <samuel at sholland.org> wrote:
>
> This series adds a minimal working HSM implementation for the Allwinner
> D1 SoC. It works with the Linux sbi_cpuidle driver. Even with canned
> values for entry/exit latency, I am seeing 30-45 mW reduction in power
> usage at idle.
>
> Since this is the first HSM driver submission, there is no example to
> follow. I have updated the series based on the comments to the RFCs.
> Still, comments welcome!

Thanks, this help us harden the OpenSBI HSM implementation.

>
> Regards,
> Samuel
>
> Changes in v3:
>  - Fix typo in commit message
>  - Move comment about priority range to function declaration
>  - Rename irqchip_plic_* functions to fdt_plic_*
>  - Add a "bool smode" parameter instead of hard coding the context ID
>
> Changes in v2:
>  - Rebase on top of the current master branch
>  - Use array_size() from sbi_types.h
>  - Use a separate variable for each CSR instead of an array
>  - Use the PLIC helpers added in earlier patches
>  - Use the saved SIE bits to program the wakeup interrupt mask
>  - Set the entry address only once during cold boot
>  - Use the generic implementation for retentive suspend
>  - Clean up/add comments throughout the HSM implementation
>
> Samuel Holland (9):
>   lib: sbi_hsm: Call a device hook during hart resume
>   lib: sbi_hsm: Assume a consistent resume address
>   lib: irqchip/plic: Constify plic_data pointers
>   lib: irqchip/plic: Factor out a context init function
>   lib: irqchip/plic: Add context save/restore helpers
>   lib: irqchip/plic: Add priority save/restore helpers
>   lib: utils/irqchip: Add FDT wrappers for PLIC save/restore functions
>   lib: utils/irqchip: Add wrapper for T-HEAD PLIC delegation
>   platform: Add HSM implementation for Allwinner D1

I have tested this series on QEMU virt machine using a custom DTB.

Applied this series on the riscv/opensbi repo

Thanks,
Anup

>
>  include/sbi/sbi_hsm.h                        |  12 +-
>  include/sbi_utils/irqchip/fdt_irqchip_plic.h |  22 ++
>  include/sbi_utils/irqchip/plic.h             |  20 +-
>  lib/sbi/sbi_hsm.c                            |  54 ++---
>  lib/utils/irqchip/fdt_irqchip_plic.c         |  39 ++++
>  lib/utils/irqchip/plic.c                     | 124 ++++++++---
>  platform/fpga/ariane/platform.c              |  19 +-
>  platform/fpga/openpiton/platform.c           |  19 +-
>  platform/generic/allwinner/objects.mk        |   6 +
>  platform/generic/allwinner/sun20i-d1.c       | 210 +++++++++++++++++++
>  10 files changed, 442 insertions(+), 83 deletions(-)
>  create mode 100644 include/sbi_utils/irqchip/fdt_irqchip_plic.h
>  create mode 100644 platform/generic/allwinner/objects.mk
>  create mode 100644 platform/generic/allwinner/sun20i-d1.c
>
> --
> 2.35.1
>
>
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