From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=NP7W=3L=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-8.2 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 289FAC2D0DB
	for <linuxppc-dev@archiver.kernel.org>; Wed, 22 Jan 2020 08:12:49 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id D8A192253D
	for <linuxppc-dev@archiver.kernel.org>; Wed, 22 Jan 2020 08:12:48 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D8A192253D
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 482dSG38mrzDqQy
	for <linuxppc-dev@archiver.kernel.org>; Wed, 22 Jan 2020 19:12:46 +1100 (AEDT)
Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized)
 smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5;
 helo=mx0b-001b2d01.pphosted.com; envelope-from=haren@linux.ibm.com;
 receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=linux.ibm.com
Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com
 [148.163.158.5])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 482dLg61vkzDqS5
 for <linuxppc-dev@lists.ozlabs.org>; Wed, 22 Jan 2020 19:07:55 +1100 (AEDT)
Received: from pps.filterd (m0127361.ppops.net [127.0.0.1])
 by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id
 00M825aV056107; Wed, 22 Jan 2020 03:07:44 -0500
Received: from pps.reinject (localhost [127.0.0.1])
 by mx0a-001b2d01.pphosted.com with ESMTP id 2xkwq8pyhy-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 22 Jan 2020 03:07:44 -0500
Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1])
 by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 00M82GxO056712;
 Wed, 22 Jan 2020 03:07:43 -0500
Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com
 [169.62.189.11])
 by mx0a-001b2d01.pphosted.com with ESMTP id 2xkwq8pyhc-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 22 Jan 2020 03:07:43 -0500
Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1])
 by ppma03dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 00M85McV020881;
 Wed, 22 Jan 2020 08:07:42 GMT
Received: from b03cxnp08028.gho.boulder.ibm.com
 (b03cxnp08028.gho.boulder.ibm.com [9.17.130.20])
 by ppma03dal.us.ibm.com with ESMTP id 2xksn6uxd4-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 22 Jan 2020 08:07:42 +0000
Received: from b03ledav006.gho.boulder.ibm.com
 (b03ledav006.gho.boulder.ibm.com [9.17.130.237])
 by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 00M87f2O62718326
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK);
 Wed, 22 Jan 2020 08:07:41 GMT
Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id 107D3C6059;
 Wed, 22 Jan 2020 08:07:41 +0000 (GMT)
Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id A1580C605D;
 Wed, 22 Jan 2020 08:07:40 +0000 (GMT)
Received: from [9.70.82.143] (unknown [9.70.82.143])
 by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP;
 Wed, 22 Jan 2020 08:07:40 +0000 (GMT)
Subject: [PATCH V5 03/14] powerpc/vas: Define nx_fault_stamp in
 coprocessor_request_block
From: Haren Myneni <haren@linux.ibm.com>
To: mpe@ellerman.id.au
In-Reply-To: <1579679802.26081.6.camel@hbabu-laptop>
References: <1579679802.26081.6.camel@hbabu-laptop>
Content-Type: text/plain; charset="UTF-8"
Date: Wed, 22 Jan 2020 00:07:36 -0800
Message-ID: <1579680456.26081.22.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, 18.0.572
 definitions=2020-01-17_05:2020-01-16,
 2020-01-17 signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 bulkscore=0 malwarescore=0
 suspectscore=1 phishscore=0 adultscore=0 priorityscore=1501 mlxscore=0
 lowpriorityscore=0 mlxlogscore=774 impostorscore=0 spamscore=0
 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1
 engine=8.12.0-1910280000 definitions=main-2001220073
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: mikey@neuling.org, herbert@gondor.apana.org.au, npiggin@gmail.com,
 hch@infradead.org, oohall@gmail.com, sukadev@linux.vnet.ibm.com,
 linuxppc-dev@lists.ozlabs.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.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 <sukadev@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
 arch/powerpc/include/asm/icswx.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h
index 9872f85..b233d1e 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) */
 
@@ -135,7 +146,12 @@ 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);
-- 
1.8.3.1