From nobody Tue Nov 4 07:28:09 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 150515099481382.34842179417512; Mon, 11 Sep 2017 10:29:54 -0700 (PDT) Received: from localhost ([::1]:59361 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1drSWw-0007PW-3O for importer@patchew.org; Mon, 11 Sep 2017 13:29:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35469) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1drSI0-0001X4-Br for qemu-devel@nongnu.org; Mon, 11 Sep 2017 13:14:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1drSHv-0004ZV-RH for qemu-devel@nongnu.org; Mon, 11 Sep 2017 13:14:28 -0400 Received: from 2.mo2.mail-out.ovh.net ([188.165.53.149]:39178) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1drSHv-0004Xq-LX for qemu-devel@nongnu.org; Mon, 11 Sep 2017 13:14:23 -0400 Received: from player770.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo2.mail-out.ovh.net (Postfix) with ESMTP id 79984AB24B for ; Mon, 11 Sep 2017 19:14:22 +0200 (CEST) Received: from zorba.kaod.org.com (LFbn-1-2231-173.w90-76.abo.wanadoo.fr [90.76.52.173]) (Authenticated sender: clg@kaod.org) by player770.ha.ovh.net (Postfix) with ESMTPSA id 4B7CF3C0073; Mon, 11 Sep 2017 19:14:15 +0200 (CEST) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-ppc@nongnu.org, qemu-devel@nongnu.org, David Gibson , Benjamin Herrenschmidt , Alexey Kardashevskiy , Alexander Graf Date: Mon, 11 Sep 2017 19:12:27 +0200 Message-Id: <20170911171235.29331-14-clg@kaod.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20170911171235.29331-1-clg@kaod.org> References: <20170911171235.29331-1-clg@kaod.org> MIME-Version: 1.0 X-Ovh-Tracer-Id: 14154250680636050259 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeelledrgedtgdduudehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddm Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 188.165.53.149 Subject: [Qemu-devel] [RFC PATCH v2 13/21] ppc/xive: handle interrupt acknowledgment by the O/S X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" When an O/S Exception is raised, the O/S acknowledges the interrupt with a special read in the TIMA. If the EO bit of the Notification Source Register (NSR) is set (and it should), the Current Processor Priority Register (CPPR) takes the value of the Pending Interrupt Priority Register (PIPR), which contains the priority of the most favored pending notification. The bit number corresponding to the priority of the pending interrupt is reseted in the Interrupt Pending Buffer (IPB) and so is the EO bit of the NSR. Signed-off-by: C=C3=A9dric Le Goater --- hw/intc/spapr_xive.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c index e5d4b723b7e0..ad3ff91b13ea 100644 --- a/hw/intc/spapr_xive.c +++ b/hw/intc/spapr_xive.c @@ -50,7 +50,24 @@ static uint8_t ipb_to_pipr(uint8_t ibp) =20 static uint64_t spapr_xive_icp_accept(ICPState *icp) { - return 0; + uint8_t nsr =3D icp->tima_os[TM_NSR]; + + qemu_irq_lower(icp->output); + + if (icp->tima_os[TM_NSR] & TM_QW1_NSR_EO) { + uint8_t cppr =3D icp->tima_os[TM_PIPR]; + + icp->tima_os[TM_CPPR] =3D cppr; + + /* Reset the pending buffer bit */ + icp->tima_os[TM_IPB] &=3D ~priority_to_ipb(cppr); + icp->tima_os[TM_PIPR] =3D ipb_to_pipr(icp->tima_os[TM_IPB]); + + /* Drop Exception bit for OS */ + icp->tima_os[TM_NSR] &=3D ~TM_QW1_NSR_EO; + } + + return (nsr << 8) | icp->tima_os[TM_CPPR]; } =20 static void spapr_xive_icp_notify(ICPState *icp) --=20 2.13.5