Re: [PATCH v11 4/8] RISC-V: Add SBI HSM suspend related defines

Anup Patel
2022-02-23T07:02:31Z

Hi Palmer

On Thu, Feb 10, 2022 at 11:20 AM Anup Patel <apatel@ventanamicro.com> wrote:
>
> From: Anup Patel <anup.patel@wdc.com>
>
> We add defines related to SBI HSM suspend call and also
> update HSM states naming as-per latest SBI specification.
>
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> Reviewed-by: Guo Ren <guoren@kernel.org>

This patch is shared with "KVM RISC-V SBI v0.3 support".
(https://lore.kernel.org/all/20220201082227.361967-2-apatel@ventanamicro.com/T/)

How do you want to handle this ?

One option is that I take this patch through the KVM RISC-V tree
and you can send this series (minus this patch) for 5.18 after the
KVM RISC-V changes have been merged.

Regards,
Anup

> ---
> arch/riscv/include/asm/sbi.h | 27 ++++++++++++++++++++++-----
> arch/riscv/kernel/cpu_ops_sbi.c | 2 +-
> arch/riscv/kvm/vcpu_sbi_hsm.c | 4 ++--
> 3 files changed, 25 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index d1c37479d828..06133b4f8e20 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -71,15 +71,32 @@ enum sbi_ext_hsm_fid {
> SBI_EXT_HSM_HART_START = 0,
> SBI_EXT_HSM_HART_STOP,
> SBI_EXT_HSM_HART_STATUS,
> + SBI_EXT_HSM_HART_SUSPEND,
> };
>
> -enum sbi_hsm_hart_status {
> - SBI_HSM_HART_STATUS_STARTED = 0,
> - SBI_HSM_HART_STATUS_STOPPED,
> - SBI_HSM_HART_STATUS_START_PENDING,
> - SBI_HSM_HART_STATUS_STOP_PENDING,
> +enum sbi_hsm_hart_state {
> + SBI_HSM_STATE_STARTED = 0,
> + SBI_HSM_STATE_STOPPED,
> + SBI_HSM_STATE_START_PENDING,
> + SBI_HSM_STATE_STOP_PENDING,
> + SBI_HSM_STATE_SUSPENDED,
> + SBI_HSM_STATE_SUSPEND_PENDING,
> + SBI_HSM_STATE_RESUME_PENDING,
> };
>
> +#define SBI_HSM_SUSP_BASE_MASK 0x7fffffff
> +#define SBI_HSM_SUSP_NON_RET_BIT 0x80000000
> +#define SBI_HSM_SUSP_PLAT_BASE 0x10000000
> +
> +#define SBI_HSM_SUSPEND_RET_DEFAULT 0x00000000
> +#define SBI_HSM_SUSPEND_RET_PLATFORM SBI_HSM_SUSP_PLAT_BASE
> +#define SBI_HSM_SUSPEND_RET_LAST SBI_HSM_SUSP_BASE_MASK
> +#define SBI_HSM_SUSPEND_NON_RET_DEFAULT SBI_HSM_SUSP_NON_RET_BIT
> +#define SBI_HSM_SUSPEND_NON_RET_PLATFORM (SBI_HSM_SUSP_NON_RET_BIT | \
> + SBI_HSM_SUSP_PLAT_BASE)
> +#define SBI_HSM_SUSPEND_NON_RET_LAST (SBI_HSM_SUSP_NON_RET_BIT | \
> + SBI_HSM_SUSP_BASE_MASK)
> +
> enum sbi_ext_srst_fid {
> SBI_EXT_SRST_RESET = 0,
> };
> diff --git a/arch/riscv/kernel/cpu_ops_sbi.c b/arch/riscv/kernel/cpu_ops_sbi.c
> index dae29cbfe550..2e16f6732cdf 100644
> --- a/arch/riscv/kernel/cpu_ops_sbi.c
> +++ b/arch/riscv/kernel/cpu_ops_sbi.c
> @@ -111,7 +111,7 @@ static int sbi_cpu_is_stopped(unsigned int cpuid)
>
> rc = sbi_hsm_hart_get_status(hartid);
>
> - if (rc == SBI_HSM_HART_STATUS_STOPPED)
> + if (rc == SBI_HSM_STATE_STOPPED)
> return 0;
> return rc;
> }
> diff --git a/arch/riscv/kvm/vcpu_sbi_hsm.c b/arch/riscv/kvm/vcpu_sbi_hsm.c
> index 2e383687fa48..1ac4b2e8e4ec 100644
> --- a/arch/riscv/kvm/vcpu_sbi_hsm.c
> +++ b/arch/riscv/kvm/vcpu_sbi_hsm.c
> @@ -60,9 +60,9 @@ static int kvm_sbi_hsm_vcpu_get_status(struct kvm_vcpu *vcpu)
> if (!target_vcpu)
> return -EINVAL;
> if (!target_vcpu->arch.power_off)
> - return SBI_HSM_HART_STATUS_STARTED;
> + return SBI_HSM_STATE_STARTED;
> else
> - return SBI_HSM_HART_STATUS_STOPPED;
> + return SBI_HSM_STATE_STOPPED;
> }
>
> static int kvm_sbi_ext_hsm_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
> --
> 2.25.1
>