linux-kernel - Re: [PATCH v4 1/6] firmware/psci: Add definitions for PSCI v1.3 specification

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Message-ID: <2868989D-73CA-4208-8B54-CC3C78A2F1EF@oracle.com>
Date: Thu, 26 Sep 2024 09:56:46 +0000
From: Miguel Luis <miguel.luis@...cle.com>
To: David Woodhouse <dwmw2@...radead.org>
CC: Paolo Bonzini <pbonzini@...hat.com>, Jonathan Corbet <corbet@....net>,
        Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
        James
 Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Lorenzo
 Pieralisi <lpieralisi@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>,
        Len Brown <len.brown@...el.com>, Shuah Khan
	<shuah@...nel.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.linux.dev"
	<kvmarm@...ts.linux.dev>,
        "linux-pm@...r.kernel.org"
	<linux-pm@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v4 1/6] firmware/psci: Add definitions for PSCI v1.3
 specification

Hi David,

> On 24 Sep 2024, at 16:05, David Woodhouse <dwmw2@...radead.org> wrote:
> 
> From: David Woodhouse <dwmw@...zon.co.uk>
> 
> The v1.3 PSCI spec (https://developer.arm.com/documentation/den0022) adds
> SYSTEM_OFF2, CLEAN_INV_MEMREGION and CLEAN_INV_MEMREGION_ATTRIBUTES
> functions. Add definitions for them and their parameters, along with the
> new TIMEOUT, RATE_LIMITED and BUSY error values.
> 

DEN0022F REL superseded DEN0022F ALP1 which doesn’t describe CLEAN_INV_MEMREGION
or CLEAN_INV_MEMREGION_ATTRIBUTES. Defining those at another time shouldn’t be a
blocker for the rest of this patchset.

> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
> ---
> include/uapi/linux/psci.h | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
> 
> diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
> index 42a40ad3fb62..082ed689fdaf 100644
> --- a/include/uapi/linux/psci.h
> +++ b/include/uapi/linux/psci.h
> @@ -59,6 +59,8 @@
> #define PSCI_1_1_FN_SYSTEM_RESET2 PSCI_0_2_FN(18)
> #define PSCI_1_1_FN_MEM_PROTECT PSCI_0_2_FN(19)
> #define PSCI_1_1_FN_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN(20)
> +#define PSCI_1_3_FN_SYSTEM_OFF2 PSCI_0_2_FN(21)
> +#define PSCI_1_3_FN_CLEAN_INV_MEMREGION_ATTRIBUTES PSCI_0_2_FN(23)
> 
> #define PSCI_1_0_FN64_CPU_DEFAULT_SUSPEND PSCI_0_2_FN64(12)
> #define PSCI_1_0_FN64_NODE_HW_STATE PSCI_0_2_FN64(13)
> @@ -68,6 +70,8 @@
> 
> #define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18)
> #define PSCI_1_1_FN64_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN64(20)
> +#define PSCI_1_3_FN64_SYSTEM_OFF2 PSCI_0_2_FN64(21)
> +#define PSCI_1_3_FN64_CLEAN_INV_MEMREGION PSCI_0_2_FN64(22)
> 
> /* PSCI v0.2 power state encoding for CPU_SUSPEND function */
> #define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
> @@ -100,6 +104,19 @@
> #define PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET 0
> #define PSCI_1_1_RESET_TYPE_VENDOR_START 0x80000000U
> 
> +/* PSCI v1.3 hibernate type for SYSTEM_OFF2 */
> +#define PSCI_1_3_HIBERNATE_TYPE_OFF 0

Should it be 1 as hibernate type?

> +
> +/* PSCI v1.3 flags for CLEAN_INV_MEMREGION */
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_FLAG_DRY_RUN BIT(0)
> +
> +/* PSCI v1.3 attributes for CLEAN_INV_MEMREGION_ATTRIBUTES */
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_OP_TYPE 0
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_CPU_RDVZ 1
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_LATENCY 2
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_RATE_LIMIT 3
> +#define PSCI_1_3_CLEAN_INV_MEMREGION_ATTR_TIMEOUT 4
> +
> /* PSCI version decoding (independent of PSCI version) */
> #define PSCI_VERSION_MAJOR_SHIFT 16
> #define PSCI_VERSION_MINOR_MASK \
> @@ -133,5 +150,8 @@
> #define PSCI_RET_NOT_PRESENT -7
> #define PSCI_RET_DISABLED -8
> #define PSCI_RET_INVALID_ADDRESS -9
> +#define PSCI_RET_TIMEOUT -10
> +#define PSCI_RET_RATE_LIMITED -11
> +#define PSCI_RET_BUSY -12
> 

Thanks
Miguel

> #endif /* _UAPI_LINUX_PSCI_H */
> -- 
> 2.44.0
> 
>