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Tue, 02 Jun 2020 07:49:23 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0527nLQt28508500 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Jun 2020 07:49:22 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BC774C6055; Tue, 2 Jun 2020 07:49:22 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 316F5C605A; Tue, 2 Jun 2020 07:49:17 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.199.34.130]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 2 Jun 2020 07:49:16 +0000 (GMT) From: "Aneesh Kumar K.V" To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, linux-nvdimm@lists.01.org, dan.j.williams@intel.com Subject: [RFC PATCH v2 2/5] powerpc/pmem: Disable synchronous fault by default Date: Tue, 2 Jun 2020 13:19:06 +0530 Message-Id: <20200602074909.36738-2-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200602074909.36738-1-aneesh.kumar@linux.ibm.com> References: <20200602074909.36738-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-02_08:2020-06-01, 2020-06-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 clxscore=1015 mlxlogscore=751 suspectscore=0 bulkscore=0 adultscore=0 malwarescore=0 cotscore=-2147483648 phishscore=0 impostorscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006020043 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jan Kara , Jeff Moyer , msuchanek@suse.de, oohall@gmail.com, "Aneesh Kumar K.V" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" This adds a kernel config option that controls whether MAP_SYNC is enabled by default. With POWER10, architecture is adding new pmem flush and sync instructions. The kernel should prevent the usage of MAP_SYNC if applications are not using the new instructions on newer hardware. This config allows user to control whether MAP_SYNC should be enabled by default or not. Signed-off-by: Aneesh Kumar K.V --- arch/powerpc/platforms/Kconfig.cputype | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 27a81c291be8..f8694838ad4e 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -383,6 +383,15 @@ config PPC_KUEP If you're unsure, say Y. +config ARCH_MAP_SYNC_DISABLE + bool "Disable synchronous fault support (MAP_SYNC)" + default y + help + Disable support for synchronous fault with nvdimm namespaces. + + If you're unsure, say Y. + + config PPC_HAVE_KUAP bool -- 2.26.2