From patchwork Thu May 11 17:53:35 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 9722647 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C23D760236 for ; Thu, 11 May 2017 17:53:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C2C40286D0 for ; Thu, 11 May 2017 17:53:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B7AA0286E5; Thu, 11 May 2017 17:53:48 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4977E286D0 for ; Thu, 11 May 2017 17:53:48 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d8sFr-0000xH-SI; Thu, 11 May 2017 17:51:59 +0000 Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1d8sFr-0000un-CR for xen-devel@lists.xenproject.org; Thu, 11 May 2017 17:51:59 +0000 Received: from [85.158.137.68] by server-6.bemta-3.messagelabs.com id 65/7A-02189-EB4A4195; Thu, 11 May 2017 17:51:58 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOLMWRWlGSWpSXmKPExsVysyfVTXffEpF Ig7bvjBbft0xmcmD0OPzhCksAYxRrZl5SfkUCa8bMNWtZC7bwVnz/8ZqpgXEJVxcjF4eQwGZG iacfjzF3MXICOcsZJeY8sQWx2QR0JXbcfA0WFxEIlXi64DszSAOzwBpGiXOLfrKBJIQFrCV6F v4BK2IRUJU48m4VC4jNCxRf3f+THcSWEJCTaDh/H6yGEyi+ZPosFohlVhK7dp9mncDIvYCRYR WjRnFqUVlqka6hoV5SUWZ6RkluYmaOrqGBsV5uanFxYnpqTmJSsV5yfu4mRqCHGYBgB+Pq306 HGCU5mJREeRknikQK8SXlp1RmJBZnxBeV5qQWH2KU4eBQkuC9tggoJ1iUmp5akZaZAww1mLQE B4+SCO9mkDRvcUFibnFmOkTqFKOilDgvz2KghABIIqM0D64NFt6XGGWlhHkZgQ4R4ilILcrNL EGVf8UozsGoJMxrBzKFJzOvBG76K6DFTECL+/8IgywuSURISTUwbqj1m+ez/VTv/L1mfxRiu/ 62JdvY3k8KDzm2RGJafKxSEk/MnBwXP/fS+cs7Wt7mzZXMLgp9etD49m/PlyF9317+f1yVVlA h9lrt9OPCzAWJG8tvn13aOMHszgWxb/Jn6vUW8H/wCt/+TcWJYYvjgeRc3++yIrYbheZozWWs yXVcVOA9wfa/EktxRqKhFnNRcSIAcaLgBWoCAAA= X-Env-Sender: andre.przywara@arm.com X-Msg-Ref: server-9.tower-31.messagelabs.com!1494525117!44544507!1 X-Originating-IP: [217.140.101.70] X-SpamReason: No, hits=0.0 required=7.0 tests= X-StarScan-Received: X-StarScan-Version: 9.4.12; banners=-,-,- X-VirusChecked: Checked Received: (qmail 52148 invoked from network); 11 May 2017 17:51:57 -0000 Received: from foss.arm.com (HELO foss.arm.com) (217.140.101.70) by server-9.tower-31.messagelabs.com with SMTP; 11 May 2017 17:51:57 -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 3EFD81BA8; Thu, 11 May 2017 10:51:57 -0700 (PDT) Received: from e104803-lin.lan (unknown [10.1.207.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 199AA3F4FF; Thu, 11 May 2017 10:51:55 -0700 (PDT) From: Andre Przywara To: Julien Grall , Stefano Stabellini Date: Thu, 11 May 2017 18:53:35 +0100 Message-Id: <20170511175340.8448-24-andre.przywara@arm.com> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20170511175340.8448-1-andre.przywara@arm.com> References: <20170511175340.8448-1-andre.przywara@arm.com> Cc: xen-devel@lists.xenproject.org, Vijaya Kumar K , Vijay Kilari , Shanker Donthineni Subject: [Xen-devel] [PATCH v9 23/28] ARM: vITS: handle DISCARD command X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP The DISCARD command drops the connection between a DeviceID/EventID and an LPI/collection pair. We mark the respective structure entries as not allocated and make sure that any queued IRQs are removed. Signed-off-by: Andre Przywara --- xen/arch/arm/vgic-v3-its.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c index ef7c78f..f7a8d77 100644 --- a/xen/arch/arm/vgic-v3-its.c +++ b/xen/arch/arm/vgic-v3-its.c @@ -723,6 +723,27 @@ out_unlock: return ret; } +static int its_handle_discard(struct virt_its *its, uint64_t *cmdptr) +{ + uint32_t devid = its_cmd_get_deviceid(cmdptr); + uint32_t eventid = its_cmd_get_id(cmdptr); + int ret; + + spin_lock(&its->its_lock); + + /* Remove from the radix tree and remove the host entry. */ + ret = its_discard_event(its, devid, eventid); + + /* Remove from the guest's ITTE. */ + if ( ret || write_itte_locked(its, devid, eventid, + UNMAPPED_COLLECTION, INVALID_LPI, NULL) ) + ret = -1; + + spin_unlock(&its->its_lock); + + return ret; +} + #define ITS_CMD_BUFFER_SIZE(baser) ((((baser) & 0xff) + 1) << 12) #define ITS_CMD_OFFSET(reg) ((reg) & GENMASK(19, 5)) @@ -755,6 +776,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its) case GITS_CMD_CLEAR: ret = its_handle_clear(its, command); break; + case GITS_CMD_DISCARD: + ret = its_handle_discard(its, command); + break; case GITS_CMD_INT: ret = its_handle_int(its, command); break;