From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=ham 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 D40C4C43331 for ; Wed, 1 Apr 2020 21:27:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEF1220719 for ; Wed, 1 Apr 2020 21:27:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733027AbgDAV1D (ORCPT ); Wed, 1 Apr 2020 17:27:03 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:25010 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732357AbgDAV1D (ORCPT ); Wed, 1 Apr 2020 17:27:03 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 031L3aQx149987; Wed, 1 Apr 2020 17:26:40 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 302070tnhw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Apr 2020 17:26:40 -0400 Received: from m0098416.ppops.net (m0098416.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 031LKOR2030182; Wed, 1 Apr 2020 17:26:40 -0400 Received: from ppma02dal.us.ibm.com (a.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.10]) by mx0b-001b2d01.pphosted.com with ESMTP id 302070tnhn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Apr 2020 17:26:40 -0400 Received: from pps.filterd (ppma02dal.us.ibm.com [127.0.0.1]) by ppma02dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 031LPnSN001216; Wed, 1 Apr 2020 21:26:39 GMT Received: from b03cxnp08027.gho.boulder.ibm.com (b03cxnp08027.gho.boulder.ibm.com [9.17.130.19]) by ppma02dal.us.ibm.com with ESMTP id 301x77cybb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Apr 2020 21:26:39 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 031LQbLo61079944 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 1 Apr 2020 21:26:37 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 801267805E; Wed, 1 Apr 2020 21:26:37 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B94197806B; Wed, 1 Apr 2020 21:26:36 +0000 (GMT) Received: from [9.70.82.143] (unknown [9.70.82.143]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 1 Apr 2020 21:26:36 +0000 (GMT) Subject: [PATCH v9 02/13] powerpc/vas: Define nx_fault_stamp in coprocessor_request_block From: Haren Myneni To: mpe@ellerman.id.au Cc: npiggin@gmail.com, mikey@neuling.org, herbert@gondor.apana.org.au, frederic.barrat@fr.ibm.com, srikar@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, hch@infradead.org, oohall@gmail.com, clg@kaod.org, sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, ajd@linux.ibm.com In-Reply-To: <1585775978.10664.438.camel@hbabu-laptop> References: <1585775978.10664.438.camel@hbabu-laptop> Content-Type: text/plain; charset="UTF-8" Date: Wed, 01 Apr 2020 14:25:50 -0700 Message-ID: <1585776350.10664.442.camel@hbabu-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-01_04:2020-03-31,2020-04-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 spamscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=868 suspectscore=1 bulkscore=0 phishscore=0 priorityscore=1501 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004010170 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Kernel sets fault address and status in CRB for NX page fault on user space address after processing page fault. User space gets the signal and handles the fault mentioned in CRB by bringing the page in to memory and send NX request again. Signed-off-by: Sukadev Bhattiprolu Signed-off-by: Haren Myneni --- arch/powerpc/include/asm/icswx.h | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h index 9872f85..965b1f3 100644 --- a/arch/powerpc/include/asm/icswx.h +++ b/arch/powerpc/include/asm/icswx.h @@ -108,6 +108,17 @@ struct data_descriptor_entry { __be64 address; } __packed __aligned(DDE_ALIGN); +/* 4.3.2 NX-stamped Fault CRB */ + +#define NX_STAMP_ALIGN (0x10) + +struct nx_fault_stamp { + __be64 fault_storage_addr; + __be16 reserved; + __u8 flags; + __u8 fault_status; + __be32 pswid; +} __packed __aligned(NX_STAMP_ALIGN); /* Chapter 6.5.2 Coprocessor-Request Block (CRB) */ @@ -135,10 +146,15 @@ struct coprocessor_request_block { struct coprocessor_completion_block ccb; - u8 reserved[48]; + union { + struct nx_fault_stamp nx; + u8 reserved[16]; + } stamp; + + u8 reserved[32]; struct coprocessor_status_block csb; -} __packed __aligned(CRB_ALIGN); +} __packed; /* RFC02167 Initiate Coprocessor Instructions document -- 1.8.3.1