From patchwork Thu Jan 18 06:29:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil V L X-Patchwork-Id: 763842 Received: from mail-io1-f44.google.com (mail-io1-f44.google.com [209.85.166.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1D39B65F for ; Thu, 18 Jan 2024 06:29:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705559389; cv=none; b=raWZPe0/R+SWnv8rE2jdVjNN+mV8s5kZ3ZoUlrvMVLh08/IKURNdevzCTdkFY7/dgQ0iAeWRN0i2O4EjHG/fB9FyAzs655xVyhjVJRcplP43dpYekfz8vCxcXIZ/RNhWoGsLCLYZfQ/xGZbtjDtqkDCXQDIvF5ozUe3C1gJcaN0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705559389; c=relaxed/simple; bh=4KmNYGZaQ/0eFb7+g3r7FVQTT3Vg5/Epy+DsR7imRXw=; h=Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Google-Smtp-Source:X-Received:Received:From: To:Cc:Subject:Date:Message-Id:X-Mailer:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding; b=rXudklQRgHXJGnnGtp/cXSXH/5MAVrUHJyhdjdMbOLuw5eCZlOxiG1KStglsGiTlPfUF6s2C2hMBvNubGooP/gU/QKsvaCKfsAN1kcM/jkCr3cX8TMb/fHkJmW8bLKFn/SqUczXsU6ZgqWEFo8CJsKjTEmiJ5TUOlDjpefIdIi8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ventanamicro.com; spf=pass smtp.mailfrom=ventanamicro.com; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.b=ZvaI7+Pf; arc=none smtp.client-ip=209.85.166.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ventanamicro.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ventanamicro.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.b="ZvaI7+Pf" Received: by mail-io1-f44.google.com with SMTP id ca18e2360f4ac-7bef44df5c6so10826739f.0 for ; Wed, 17 Jan 2024 22:29:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1705559386; x=1706164186; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KVSbOzgJs1igIWqQu9lDLW42aL5tdwTQfAgqMSjQkJE=; b=ZvaI7+PfPpMNJsNpPTK2WpoiI+vbIyGVTyxMSY6Oc1j0SLuZesKlO3DVFREeVuVR9U Meu87ib/7Ffuo1NZKHfKuLogGiJp22+eZ6a21W35staHohUT2EfIePssbIaDerjOuES8 KUCCdPTo/ISnRDYWmwgo9r9E6EKG1oAJz+u4+eWtkKlbyYtQrrmPE0P++CaoAeGM22Xb 5hdY8dwJPbXkx5Orwun0/xiZmoDj7rNJynfyJ6ao88FmhDp7b6VCT6e7BZgmhg6bDu8+ ewdEaJ1yh22TEZ6R7SbiBgtJrQdK03skW4lX+6VcMtAyUxg5cHpQNpSEeDFhsbeKZY64 eg1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705559386; x=1706164186; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KVSbOzgJs1igIWqQu9lDLW42aL5tdwTQfAgqMSjQkJE=; b=Rdd3Esq1fHTt4YkFMM0+O1kciSSoGMw7kzpDfiet8oYpELlM7anO2d2dGt1YLk/r33 gKz2To2jOPRCpYMR4qsXii1KiXvCMZ/tmR19yPllTRLsJc17vxLNl+6INl9bAgL7U7g+ PN3+LD9ch7oDcHD3ShlAQofHgLiVD7snRy+NblTWO6y9Z/FlYSlTafGp3Y1xb55F5POf dMKe/5qhJ1Bhrox+9sndJ1HFKPpnpF/6nSDnVj6rtqnhURglXnrBH/8eWHPwAf5aut0C OdSQCbaD02hjnmnybnoJE574vnSvS0UzHXuNCanZVmnVQ2vyiTP1mbaEQlBd0aHAvozK MC+Q== X-Gm-Message-State: AOJu0YzUCk1AHGJHYcf8lvA13iYqob92QvYh2QChHtHPDv0HMAGndM40 72r4QbYa4dTbQco8grpFEgwxxC9rrljEiaiASQvBcQX+P8rb+CQej0DEU/peERM2f3foAZCHqLP ivkI= X-Google-Smtp-Source: AGHT+IHGQHjpLDXAypTn1Zx6QEntcYHv7EtMpW/QZNfiHZ98kua3F5Js0zUATDQyTIczTGIi34cWCA== X-Received: by 2002:a05:6e02:18cc:b0:35d:6be7:55d9 with SMTP id s12-20020a056e0218cc00b0035d6be755d9mr1647457ilu.0.1705559386085; Wed, 17 Jan 2024 22:29:46 -0800 (PST) Received: from sunil-laptop.dc1.ventanamicro.com ([106.51.83.242]) by smtp.gmail.com with ESMTPSA id bn28-20020a056e02339c00b0035fec699584sm4663269ilb.13.2024.01.17.22.29.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jan 2024 22:29:45 -0800 (PST) From: Sunil V L To: linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: "Rafael J . Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou , Len Brown , Anup Patel , Daniel Lezcano , Andrew Jones , Conor Dooley , Atish Kumar Patra , Sunil V L Subject: [PATCH v3 -next 1/3] cpuidle: RISC-V: Move few functions to arch/riscv Date: Thu, 18 Jan 2024 11:59:28 +0530 Message-Id: <20240118062930.245937-2-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240118062930.245937-1-sunilvl@ventanamicro.com> References: <20240118062930.245937-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 To support ACPI Low Power Idle (LPI), few functions are required which are currently static functions in the DT based cpuidle driver. Hence, move them under arch/riscv so that ACPI driver also can use them. Since they are no longer static functions, append "riscv_" prefix to the function name. Signed-off-by: Sunil V L Reviewed-by: Andrew Jones --- arch/riscv/include/asm/suspend.h | 3 ++ arch/riscv/kernel/suspend.c | 49 +++++++++++++++++++++++++++++ drivers/cpuidle/cpuidle-riscv-sbi.c | 49 +++-------------------------- 3 files changed, 57 insertions(+), 44 deletions(-) diff --git a/arch/riscv/include/asm/suspend.h b/arch/riscv/include/asm/suspend.h index 02f87867389a..076f8a9437cf 100644 --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -55,4 +55,7 @@ int hibernate_resume_nonboot_cpu_disable(void); asmlinkage void hibernate_restore_image(unsigned long resume_satp, unsigned long satp_temp, unsigned long cpu_resume); asmlinkage int hibernate_core_restore_code(void); +bool riscv_sbi_hsm_is_supported(void); +bool riscv_sbi_suspend_state_is_valid(u32 state); +int riscv_sbi_hart_suspend(u32 state); #endif diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c index 239509367e42..b20f2cb5879f 100644 --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -128,4 +128,53 @@ static int __init sbi_system_suspend_init(void) } arch_initcall(sbi_system_suspend_init); + +static int sbi_suspend_finisher(unsigned long suspend_type, + unsigned long resume_addr, + unsigned long opaque) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_SUSPEND, + suspend_type, resume_addr, opaque, 0, 0, 0); + + return (ret.error) ? sbi_err_map_linux_errno(ret.error) : 0; +} + +int riscv_sbi_hart_suspend(u32 state) +{ + if (state & SBI_HSM_SUSP_NON_RET_BIT) + return cpu_suspend(state, sbi_suspend_finisher); + else + return sbi_suspend_finisher(state, 0, 0); +} + +bool riscv_sbi_suspend_state_is_valid(u32 state) +{ + if (state > SBI_HSM_SUSPEND_RET_DEFAULT && + state < SBI_HSM_SUSPEND_RET_PLATFORM) + return false; + + if (state > SBI_HSM_SUSPEND_NON_RET_DEFAULT && + state < SBI_HSM_SUSPEND_NON_RET_PLATFORM) + return false; + + return true; +} + +bool riscv_sbi_hsm_is_supported(void) +{ + /* + * The SBI HSM suspend function is only available when: + * 1) SBI version is 0.3 or higher + * 2) SBI HSM extension is available + */ + if (sbi_spec_version < sbi_mk_version(0, 3) || + !sbi_probe_extension(SBI_EXT_HSM)) { + pr_info("HSM suspend not available\n"); + return false; + } + + return true; +} #endif /* CONFIG_RISCV_SBI */ diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c index e8094fc92491..a6e123dfe394 100644 --- a/drivers/cpuidle/cpuidle-riscv-sbi.c +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c @@ -73,26 +73,6 @@ static inline bool sbi_is_domain_state_available(void) return data->available; } -static int sbi_suspend_finisher(unsigned long suspend_type, - unsigned long resume_addr, - unsigned long opaque) -{ - struct sbiret ret; - - ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_SUSPEND, - suspend_type, resume_addr, opaque, 0, 0, 0); - - return (ret.error) ? sbi_err_map_linux_errno(ret.error) : 0; -} - -static int sbi_suspend(u32 state) -{ - if (state & SBI_HSM_SUSP_NON_RET_BIT) - return cpu_suspend(state, sbi_suspend_finisher); - else - return sbi_suspend_finisher(state, 0, 0); -} - static __cpuidle int sbi_cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { @@ -100,9 +80,9 @@ static __cpuidle int sbi_cpuidle_enter_state(struct cpuidle_device *dev, u32 state = states[idx]; if (state & SBI_HSM_SUSP_NON_RET_BIT) - return CPU_PM_CPU_IDLE_ENTER_PARAM(sbi_suspend, idx, state); + return CPU_PM_CPU_IDLE_ENTER_PARAM(riscv_sbi_hart_suspend, idx, state); else - return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(sbi_suspend, + return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(riscv_sbi_hart_suspend, idx, state); } @@ -133,7 +113,7 @@ static __cpuidle int __sbi_enter_domain_idle_state(struct cpuidle_device *dev, else state = states[idx]; - ret = sbi_suspend(state) ? -1 : idx; + ret = riscv_sbi_hart_suspend(state) ? -1 : idx; ct_cpuidle_exit(); @@ -206,17 +186,6 @@ static const struct of_device_id sbi_cpuidle_state_match[] = { { }, }; -static bool sbi_suspend_state_is_valid(u32 state) -{ - if (state > SBI_HSM_SUSPEND_RET_DEFAULT && - state < SBI_HSM_SUSPEND_RET_PLATFORM) - return false; - if (state > SBI_HSM_SUSPEND_NON_RET_DEFAULT && - state < SBI_HSM_SUSPEND_NON_RET_PLATFORM) - return false; - return true; -} - static int sbi_dt_parse_state_node(struct device_node *np, u32 *state) { int err = of_property_read_u32(np, "riscv,sbi-suspend-param", state); @@ -226,7 +195,7 @@ static int sbi_dt_parse_state_node(struct device_node *np, u32 *state) return err; } - if (!sbi_suspend_state_is_valid(*state)) { + if (!riscv_sbi_suspend_state_is_valid(*state)) { pr_warn("Invalid SBI suspend state %#x\n", *state); return -EINVAL; } @@ -607,16 +576,8 @@ static int __init sbi_cpuidle_init(void) int ret; struct platform_device *pdev; - /* - * The SBI HSM suspend function is only available when: - * 1) SBI version is 0.3 or higher - * 2) SBI HSM extension is available - */ - if ((sbi_spec_version < sbi_mk_version(0, 3)) || - !sbi_probe_extension(SBI_EXT_HSM)) { - pr_info("HSM suspend not available\n"); + if (!riscv_sbi_hsm_is_supported()) return 0; - } ret = platform_driver_register(&sbi_cpuidle_driver); if (ret) From patchwork Thu Jan 18 06:29:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil V L X-Patchwork-Id: 764412 Received: from mail-il1-f173.google.com (mail-il1-f173.google.com [209.85.166.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C31D1C144 for ; 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Wed, 17 Jan 2024 22:29:51 -0800 (PST) Received: from sunil-laptop.dc1.ventanamicro.com ([106.51.83.242]) by smtp.gmail.com with ESMTPSA id bn28-20020a056e02339c00b0035fec699584sm4663269ilb.13.2024.01.17.22.29.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jan 2024 22:29:51 -0800 (PST) From: Sunil V L To: linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: "Rafael J . Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou , Len Brown , Anup Patel , Daniel Lezcano , Andrew Jones , Conor Dooley , Atish Kumar Patra , Sunil V L Subject: [PATCH v3 -next 2/3] ACPI: RISC-V: Add LPI driver Date: Thu, 18 Jan 2024 11:59:29 +0530 Message-Id: <20240118062930.245937-3-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240118062930.245937-1-sunilvl@ventanamicro.com> References: <20240118062930.245937-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Enable Low Power Idle (LPI) based cpuidle driver for RISC-V platforms. It depends on SBI HSM calls for idle state transitions. Signed-off-by: Sunil V L Reviewed-by: Andrew Jones --- drivers/acpi/riscv/Makefile | 3 +- drivers/acpi/riscv/cpuidle.c | 81 ++++++++++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+), 1 deletion(-) create mode 100644 drivers/acpi/riscv/cpuidle.c diff --git a/drivers/acpi/riscv/Makefile b/drivers/acpi/riscv/Makefile index 8b3b126e0b94..7309d92dd477 100644 --- a/drivers/acpi/riscv/Makefile +++ b/drivers/acpi/riscv/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only -obj-y += rhct.o +obj-y += rhct.o +obj-$(CONFIG_ACPI_PROCESSOR_IDLE) += cpuidle.o diff --git a/drivers/acpi/riscv/cpuidle.c b/drivers/acpi/riscv/cpuidle.c new file mode 100644 index 000000000000..624f9bbdb58c --- /dev/null +++ b/drivers/acpi/riscv/cpuidle.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2024, Ventana Micro Systems Inc + * Author: Sunil V L + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define RISCV_FFH_LPI_TYPE_MASK GENMASK_ULL(63, 60) +#define RISCV_FFH_LPI_RSVD_MASK GENMASK_ULL(59, 32) + +#define RISCV_FFH_LPI_TYPE_SBI BIT_ULL(60) + +static int acpi_cpu_init_idle(unsigned int cpu) +{ + int i; + struct acpi_lpi_state *lpi; + struct acpi_processor *pr = per_cpu(processors, cpu); + + if (unlikely(!pr || !pr->flags.has_lpi)) + return -EINVAL; + + if (!riscv_sbi_hsm_is_supported()) + return -ENODEV; + + if (pr->power.count <= 1) + return -ENODEV; + + for (i = 1; i < pr->power.count; i++) { + u32 state; + + lpi = &pr->power.lpi_states[i]; + + /* + * Validate Entry Method as per FFH spec. + * bits[63:60] should be 0x1 + * bits[59:32] should be 0x0 + * bits[31:0] represent a SBI power_state + */ + if (((lpi->address & RISCV_FFH_LPI_TYPE_MASK) != RISCV_FFH_LPI_TYPE_SBI) || + (lpi->address & RISCV_FFH_LPI_RSVD_MASK)) { + pr_warn("Invalid LPI entry method %#llx\n", lpi->address); + return -EINVAL; + } + + state = lpi->address; + if (!riscv_sbi_suspend_state_is_valid(state)) { + pr_warn("Invalid SBI power state %#x\n", state); + return -EINVAL; + } + } + + return 0; +} + +int acpi_processor_ffh_lpi_probe(unsigned int cpu) +{ + return acpi_cpu_init_idle(cpu); +} + +int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi) +{ + u32 state = lpi->address; + + if (state & SBI_HSM_SUSP_NON_RET_BIT) + return CPU_PM_CPU_IDLE_ENTER_PARAM(riscv_sbi_hart_suspend, + lpi->index, + state); + else + return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(riscv_sbi_hart_suspend, + lpi->index, + state); +} From patchwork Thu Jan 18 06:29:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil V L X-Patchwork-Id: 763841 Received: from mail-il1-f179.google.com (mail-il1-f179.google.com [209.85.166.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 64B8411CAE for ; Thu, 18 Jan 2024 06:29:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705559399; cv=none; b=e9JsSl/hVm29X3PBRiI+mBe/lwhdhvznxFlElr2CFt3szGSZkaeFDwmknZvtXf1lP1BrdUmEcMcM6cIUwLPXPVnIFM+fp7ID1Jv1cGz2GWzDS6EdzgZNaZv+mxq34v83BRP8NghpW0/0EINxVKwgyRY6vYJyhxFnXvUvD12D7t0= ARC-Message-Signature: i=1; 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Wed, 17 Jan 2024 22:29:56 -0800 (PST) From: Sunil V L To: linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: "Rafael J . Wysocki" , Pavel Machek , Paul Walmsley , Palmer Dabbelt , Albert Ou , Len Brown , Anup Patel , Daniel Lezcano , Andrew Jones , Conor Dooley , Atish Kumar Patra , Sunil V L Subject: [PATCH v3 -next 3/3] ACPI: Enable ACPI_PROCESSOR for RISC-V Date: Thu, 18 Jan 2024 11:59:30 +0530 Message-Id: <20240118062930.245937-4-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240118062930.245937-1-sunilvl@ventanamicro.com> References: <20240118062930.245937-1-sunilvl@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The ACPI processor driver is not currently enabled for RISC-V. This is required to enable CPU related functionalities like LPI and CPPC. Hence, enable ACPI_PROCESSOR for RISC-V. Signed-off-by: Sunil V L Reviewed-by: Andrew Jones --- drivers/acpi/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index f819e760ff19..9a920752171c 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -282,7 +282,7 @@ config ACPI_CPPC_LIB config ACPI_PROCESSOR tristate "Processor" - depends on X86 || ARM64 || LOONGARCH + depends on X86 || ARM64 || LOONGARCH || RISCV select ACPI_PROCESSOR_IDLE select ACPI_CPU_FREQ_PSS if X86 || LOONGARCH select THERMAL