From patchwork Thu Jan 31 14:58:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Thierry X-Patchwork-Id: 10790751 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 89B4214E1 for ; Thu, 31 Jan 2019 15:01:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B5DD3120A for ; Thu, 31 Jan 2019 15:01:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6BEE63137A; Thu, 31 Jan 2019 15:01:15 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0BE7F311F8 for ; Thu, 31 Jan 2019 15:01:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=GW8SQ7Gxs5iuJifUYdVLBhHzXyrxa9Lrc8M653k/Jsg=; b=ei/1ZeJNaQ0KYONLGKm4pL6y/K wQeOZwlAEXazcS5rlO7Xa+A5hXKODnCl/mCrkaFuCq82kBjvh1do7bDwttfA3ED/SgCqs1QtGBKDA Aolc6h8WAsIpm+BJdNpNwovfxUPMpfvn5r+SwmIwqFY0KZy/TkF7tXaeCF0FeHK+l8IGSYURYLRUb 4ftJfQEy1+xSTySDN8MIQ10EIMv2OxXOzRbj6Vjx6qxgAkysvezZDcyR9sXwM4g82hetIQE/zD6ik 27BlKmACi3bLv2vOBSMqn4Q9W6K6GYA2/B0UboZHZ7a/y7G+G6LHDP7P+/Mi+i9x73kwzd2B7X72V EsaclS6Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gpDq4-0000nv-Qw; Thu, 31 Jan 2019 15:01:12 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gpDoT-0006It-Ef for linux-arm-kernel@lists.infradead.org; Thu, 31 Jan 2019 14:59:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E97CD15AD; Thu, 31 Jan 2019 06:59:32 -0800 (PST) Received: from e112298-lin.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CCEF43F59C; Thu, 31 Jan 2019 06:59:30 -0800 (PST) From: Julien Thierry To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v10 07/25] arm64: ptrace: Provide definitions for PMR values Date: Thu, 31 Jan 2019 14:58:45 +0000 Message-Id: <1548946743-38979-8-git-send-email-julien.thierry@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1548946743-38979-1-git-send-email-julien.thierry@arm.com> References: <1548946743-38979-1-git-send-email-julien.thierry@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190131_065934_173622_377C29F4 X-CRM114-Status: GOOD ( 10.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, daniel.thompson@linaro.org, Julien Thierry , marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, christoffer.dall@arm.com, james.morse@arm.com, Oleg Nesterov , joel@joelfernandes.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce fixed values for PMR that are going to be used to mask and unmask interrupts by priority. The current priority given to GIC interrupts is 0xa0, so clearing PMR's most significant bit is enough to mask interrupts. Signed-off-by: Julien Thierry Suggested-by: Daniel Thompson Acked-by: Catalin Marinas Acked-by: Marc Zyngier Cc: Oleg Nesterov Cc: Catalin Marinas Cc: Will Deacon --- arch/arm64/include/asm/ptrace.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index fce22c4..8b131bc 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -25,6 +25,18 @@ #define CurrentEL_EL1 (1 << 2) #define CurrentEL_EL2 (2 << 2) +/* + * PMR values used to mask/unmask interrupts. + * + * GIC priority masking works as follows: if an IRQ's priority is a higher value + * than the value held in PMR, that IRQ is masked. Lowering the value of PMR + * means masking more IRQs (or at least that the same IRQs remain masked). + * + * To mask interrupts, we clear the most significant bit of PMR. + */ +#define GIC_PRIO_IRQON 0xf0 +#define GIC_PRIO_IRQOFF (GIC_PRIO_IRQON & ~0x80) + /* Additional SPSR bits not exposed in the UABI */ #define PSR_IL_BIT (1 << 20)