From patchwork Sat Nov 7 08:13:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 321511 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 354AFC388F7 for ; Sat, 7 Nov 2020 08:14:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F21A6221FF for ; Sat, 7 Nov 2020 08:14:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="AvNRiFUi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728053AbgKGIOy (ORCPT ); Sat, 7 Nov 2020 03:14:54 -0500 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:57208 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727801AbgKGIOy (ORCPT ); Sat, 7 Nov 2020 03:14:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1604736893; x=1636272893; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=LAnvTxuCrxiYwbhYLblxFRB980/m85EFlvtWJ9EMVlc=; b=AvNRiFUi/g0J+eQMYJhslS3zYVtEWLyGrjIbPYtF1ifpqUII//WJxMWa q/CTnJmaJ2miZ3fbNvcBGP9ARxsq9BOmjnuRdy3b1YZsMsLk3rRiclXyn F8qTPfF+O8qdKcfXJlT6vMtRrDhB1D3kRafVvQUV+MOqBMSZ5I/GwPwIN nv1i/EhWZLXdbn4dzcTVkCAEI2Z/FDOuhYW/Vf4LDX5caRx3YCxNf9q/V A+1uiQjZ8kthqaN3lEqSAsAA/f8o7k3vHFsfUOMD5V5b70p2JehrRGCUv WaeB4z+GFE2amBr/E50qc9kAbKVXI1vXA197npyovMtaFSKI6gywpUEe7 g==; IronPort-SDR: iQHLhyxSnAQ6UbZTXVbbCWX5CmobaHM5YT2+wrEwPygC6wjBqCqXtDzAu59U0WTH0GgI1pgaEA Kdjo7MH7FNhIJ4EVsjenaJTC1XCsF85FXFcpCd50JG80afHUPGaRwSdS7L7y3jjFiGuc/cJQzt YjcQM01k8c6J13dgaE626H1n4s+z3ix44Yx97uMgKF0npRb2aoMvVRzZs6154Pew2hbmd0f27f vAlSjGdMZePq2G54YJh4HEiCB52gb2iUrCRBmiEpw4PfRAG6xE9r21+3rcoJmN8qTk84XyxsM5 ISA= X-IronPort-AV: E=Sophos;i="5.77,459,1596470400"; d="scan'208";a="156564380" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 07 Nov 2020 16:14:53 +0800 IronPort-SDR: DlrFS8IZ00iaxHHXk2zhRAyNoaJnndD2Yq+UKdGOWZuQ6boj3VYnXnhQv+pNawar+QnGe+pvQ6 XD0yiK3wCFTwK4e64mXcGy+ewY2ThGnqsPCxGFpk/HCn8YkGBuBsGbwbah4O5ErTCUlBzw/7R/ aBYmSuvXNOD0zGZuim9LJOB00uEhJ9iLwwgoSqjIr964gIFAttGzdO97DP3SfM7MM+z4xnH2x9 ylpve1luyKkS0ACZYO5OvSfw/Wz53tAk4CH2+Jt2GvuK8WrIOlchwND8493tYvXLBD1P3AwL5O X1NQ44MUmh5wBcTGEJBw3drj Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2020 23:59:44 -0800 IronPort-SDR: fT23JgunU722jRduFvljIERP725lvkEaBUxXqos8amCUHUNMsIduVaQQXwkSxtHAaC+rJkBUv8 IvTev3D8aeVnB4NxdarvBXucISWuB6ZyoMelBOI2ZIojCbT8rhZKjGN7NqrhDY08NzgXuj1dZD BfR5vSeXRdYSz4gjqPEL39VpTt4d3XqZT2b6fs4l9qpgWZna7a0KhuWToPbyg9xfVGxKP4wwS6 IqL+0nQc6LEjj7EJY7/K0WPS4cmWaTD7UVxP2dOVC1SbZZb0hVOVPGcXAUU1iB90e3fxudnB3D vtg= WDCIronportException: Internal Received: from hdrdzf2.ad.shared (HELO twashi.fujisawa.hgst.com) ([10.84.71.85]) by uls-op-cesaip01.wdc.com with ESMTP; 07 Nov 2020 00:14:51 -0800 From: Damien Le Moal To: Palmer Dabbelt , linux-riscv@lists.infradead.org, Rob Herring , Frank Rowand , devicetree@vger.kernel.org, Serge Semin , Mark Brown , linux-spi@vger.kernel.org, Stephen Boyd , linux-clk@vger.kernel.org, Linus Walleij , linux-gpio@vger.kernel.org, Philipp Zabel Cc: Sean Anderson Subject: [PATCH 11/32] riscv: Enable interrupts during syscalls with M-Mode Date: Sat, 7 Nov 2020 17:13:59 +0900 Message-Id: <20201107081420.60325-12-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201107081420.60325-1-damien.lemoal@wdc.com> References: <20201107081420.60325-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org When running is M-Mode (no MMU config), MPIE does not get set. This results in all syscalls being executed with interrupts disabled as handle_exception never sets SR_IE as it always sees SR_PIE being cleared. Fix this by always force enabling interrupts in handle_syscall when CONFIG_RISCV_M_MODE is enabled. Signed-off-by: Damien Le Moal --- arch/riscv/kernel/entry.S | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 524d918f3601..080eb8d78589 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -155,6 +155,15 @@ skip_context_tracking: tail do_trap_unknown handle_syscall: +#ifdef CONFIG_RISCV_M_MODE + /* + * When running is M-Mode (no MMU config), MPIE does not get set. + * As a result, we need to force enable interrupts here because + * handle_exception did not do set SR_IE as it always sees SR_PIE + * being cleared. + */ + csrs CSR_STATUS, SR_IE +#endif #if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING) /* Recover a0 - a7 for system calls */ REG_L a0, PT_A0(sp)