From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D5B1F233731; Mon, 10 Mar 2025 17:38:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741628291; cv=none; b=kpNCQGpk/2Hsj234d8I+Jsbfmx2OSCjEMIvwBMXM6FOYU01r8wlydQtK8v935c9x6S9Exo9JNjFAjPsceY/7EZc5/WWfknpynwWxykT/23Jl4H62gUyEtPMLHjf8aZp7KraAgEcxv/JVnzzw4nimA8eC0ORsMbJrUynyEvlpq30= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741628291; c=relaxed/simple; bh=IVKb3LvF+3JmRR2lBLhuoJEcy1z2BBwtM1tJHmEvLKs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q5KQWm1vCdcEYt0v/nFaOxzt++tZJobHGfKwWNR20mQCciLXXi7t6laFEUHD3Z6necylImARDvxYCAIwVSSjfYdT77SIkHP2QaMgUzvix7SXxvCY43A8R9subtAGOrf47CFbcgiHhaHJmZX0dSGsO2hYTcc9k6J9lwhmRpRTRJc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=d5a8cvgh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="d5a8cvgh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AE50C4CEEC; Mon, 10 Mar 2025 17:38:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741628291; bh=IVKb3LvF+3JmRR2lBLhuoJEcy1z2BBwtM1tJHmEvLKs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d5a8cvghMJ75fJHf3ZDrIrR3vECN/lymzDtOE2CDJcbRUqO4I8h1g2sSpB2QO89a8 JNLRGztV2UqYZBBKZgW3KdH8uQP/vMzVH7JVxWEFns5QJoZCMHxWPVzJPgSgZ/KCzZ SA2rHp8XzvTDGYMK/bMmwCqX7+zNdj4EZSswG7Uc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Samuel Holland , Conor Dooley , Andrew Jones , Palmer Dabbelt Subject: [PATCH 6.6 132/145] riscv: Save/restore envcfg CSR during CPU suspend Date: Mon, 10 Mar 2025 18:07:06 +0100 Message-ID: <20250310170440.088791382@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250310170434.733307314@linuxfoundation.org> References: <20250310170434.733307314@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Samuel Holland commit 05ab803d1ad8ac505ade77c6bd3f86b1b4ea0dc4 upstream. The value of the [ms]envcfg CSR is lost when entering a nonretentive idle state, so the CSR must be rewritten when resuming the CPU. Cc: # v6.7+ Fixes: 43c16d51a19b ("RISC-V: Enable cbo.zero in usermode") Signed-off-by: Samuel Holland Reviewed-by: Conor Dooley Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20240228065559.3434837-4-samuel.holland@sifive.com Signed-off-by: Palmer Dabbelt Signed-off-by: Greg Kroah-Hartman --- arch/riscv/include/asm/suspend.h | 1 + arch/riscv/kernel/suspend.c | 4 ++++ 2 files changed, 5 insertions(+) --- a/arch/riscv/include/asm/suspend.h +++ b/arch/riscv/include/asm/suspend.h @@ -14,6 +14,7 @@ struct suspend_context { struct pt_regs regs; /* Saved and restored by high-level functions */ unsigned long scratch; + unsigned long envcfg; unsigned long tvec; unsigned long ie; #ifdef CONFIG_MMU --- a/arch/riscv/kernel/suspend.c +++ b/arch/riscv/kernel/suspend.c @@ -11,6 +11,8 @@ void suspend_save_csrs(struct suspend_context *context) { context->scratch = csr_read(CSR_SCRATCH); + if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_XLINUXENVCFG)) + context->envcfg = csr_read(CSR_ENVCFG); context->tvec = csr_read(CSR_TVEC); context->ie = csr_read(CSR_IE); @@ -32,6 +34,8 @@ void suspend_save_csrs(struct suspend_co void suspend_restore_csrs(struct suspend_context *context) { csr_write(CSR_SCRATCH, context->scratch); + if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_XLINUXENVCFG)) + csr_write(CSR_ENVCFG, context->envcfg); csr_write(CSR_TVEC, context->tvec); csr_write(CSR_IE, context->ie);