From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EFB1E30C366; Fri, 4 Sep 2026 05:52:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788501171; cv=none; b=VlaE09Op/PMobW+2W3BzwCDXK03VtmFMrQLzDT79raMnD+2QowBhyUE7lUOU05+l5VW1oGYRoUVoRx1oFgixDZI3Errl0GPl/I2ct8kwxLMcCW/Aw7XEokPiE6eQBK3S+XPF5V5HAEQTBypWSSWtBCWkrB35tTaJVEnrfCZG9LY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788501171; c=relaxed/simple; bh=+vb/oOM6EjIbDRbqI94id+mOC/wdogDXIltJOFCYqiI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=evrTtsjL0+x7nEHlU9tQxo+AtH/5jLg351BtkfltBjEo+fp68CQamvE8fw+eOV4bYBI9kDN0Sx10qOj3M3GiYMrfKP+WbipwaYQo+w+qsGPUIY42Suy8aNzAcm+A83WrphwfoOdqcrvPJKSiJvF9x1Vuv8pqU1AIv/YlqDaQrHg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=A9z9f3Ii; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="A9z9f3Ii" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A8001F00A3D; Fri, 4 Sep 2026 05:52:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788501169; bh=VQIgUwcizAohAIC9o+qwJHcvmI754pvlW+IGDcWhzbE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=A9z9f3IikN1TApil+/sZBdBhW9QjVDzcZb1hY5hcrWHthMm+yjhQPaqlZt1Abo/1i AHBM7Z++WvsnpL0FtNvvOQdo6aqGQWstIC7jc7+ooKSiZ1Sg50jhK5DS2io6y+PKiK 6KBwLJySK67oYad1mMPw7LSBYzz+tsBfBESkp3cA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sudeep Holla , Yixun Lan , Sunil V L , Huisong Li , Peixin Xie , Paul Walmsley Subject: [PATCH 6.18 316/552] riscv: acpi: Handle LPI architectural context loss flags Date: Fri, 4 Sep 2026 06:57:53 +0200 Message-ID: <20260904045757.441844084@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045747.813364717@linuxfoundation.org> References: <20260904045747.813364717@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peixin Xie commit 7e4cb63d61a7e0bef20f0d00e831c7fac06e4a1c upstream. Commit 4785aa802853 ("cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer") replaced the generic nonzero check for LPI architectural context loss flags with arch_get_idle_state_flags(). RISC-V does not implement the helper, so it falls back to the stub that returns 0. Consequently, CPUIDLE_FLAG_TIMER_STOP is not set when an LPI state loses the hart timer context, preventing cpuidle from using a broadcast timer for that state. Implement the RISC-V helper and map the hart timer context loss flag to CPUIDLE_FLAG_TIMER_STOP. Fixes: 4785aa802853 ("cpuidle, ACPI: Evaluate LPI arch_flags for broadcast timer") Cc: stable@vger.kernel.org Acked-by: Sudeep Holla Reviewed-by: Yixun Lan Reviewed-by: Sunil V L Reviewed-by: Huisong Li Signed-off-by: Peixin Xie Link: https://patch.msgid.link/20260803-riscv-acpi-lpi-timer-v3-1-520fa13732f5@linux.spacemit.com Signed-off-by: Paul Walmsley Signed-off-by: Greg Kroah-Hartman --- arch/riscv/include/asm/acpi.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) --- a/arch/riscv/include/asm/acpi.h +++ b/arch/riscv/include/asm/acpi.h @@ -12,6 +12,8 @@ #ifndef _ASM_ACPI_H #define _ASM_ACPI_H +#include + /* Basic configuration for ACPI */ #ifdef CONFIG_ACPI @@ -71,6 +73,23 @@ int acpi_get_riscv_isa(struct acpi_table void acpi_get_cbo_block_size(struct acpi_table_header *table, u32 *cbom_size, u32 *cboz_size, u32 *cbop_size); + +/* + * RISC-V Functional Fixed Hardware Specification Version v1.0.1, + * Chapter 3.1.2, Table 4: Arch. Context Lost Flags + */ +#define RISCV_LPI_HART_TIMER_CTXT_LOST BIT(0) + +static inline unsigned int arch_get_idle_state_flags(u32 arch_flags) +{ + if (arch_flags & RISCV_LPI_HART_TIMER_CTXT_LOST) + return CPUIDLE_FLAG_TIMER_STOP; + + return 0; +} + +#define arch_get_idle_state_flags arch_get_idle_state_flags + #else static inline void acpi_init_rintc_map(void) { } static inline struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)