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Mon, 3 Feb 2020 17:09:41 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 62E78C6057; Mon, 3 Feb 2020 17:09:39 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.85.92.150]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 3 Feb 2020 17:09:38 +0000 (GMT) X-Mailer: emacs 27.0.60 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Dan Williams , linux-nvdimm@lists.01.org Subject: Re: [PATCH 3/5] libnvdimm/namespace: Enforce memremap_compat_align() In-Reply-To: <158041477336.3889308.4581652885008605170.stgit@dwillia2-desk3.amr.corp.intel.com> References: <158041475480.3889308.655103391935006598.stgit@dwillia2-desk3.amr.corp.intel.com> <158041477336.3889308.4581652885008605170.stgit@dwillia2-desk3.amr.corp.intel.com> Date: Mon, 03 Feb 2020 22:39:37 +0530 Message-ID: <87sgjrfvhq.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-02-03_06:2020-02-02, 2020-02-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=2 adultscore=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 priorityscore=1501 impostorscore=0 spamscore=0 phishscore=0 clxscore=1015 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1911200001 definitions=main-2002030127 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: linuxppc-dev@lists.ozlabs.org, hch@lst.de, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Dan Williams writes: > The pmem driver on PowerPC crashes with the following signature when > instantiating misaligned namespaces that map their capacity via > memremap_pages(). > > BUG: Unable to handle kernel data access at 0xc001000406000000 > Faulting instruction address: 0xc000000000090790 > NIP [c000000000090790] arch_add_memory+0xc0/0x130 > LR [c000000000090744] arch_add_memory+0x74/0x130 > Call Trace: > arch_add_memory+0x74/0x130 (unreliable) > memremap_pages+0x74c/0xa30 > devm_memremap_pages+0x3c/0xa0 > pmem_attach_disk+0x188/0x770 > nvdimm_bus_probe+0xd8/0x470 > > With the assumption that only memremap_pages() has alignment > constraints, enforce memremap_compat_align() for > pmem_should_map_pages(), nd_pfn, or nd_dax cases. > Reviewed-by: Aneesh Kumar K.V > Reported-by: Aneesh Kumar K.V > Cc: Jeff Moyer > Signed-off-by: Dan Williams > --- > drivers/nvdimm/namespace_devs.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c > index 032dc61725ff..aff1f32fdb4f 100644 > --- a/drivers/nvdimm/namespace_devs.c > +++ b/drivers/nvdimm/namespace_devs.c > @@ -1739,6 +1739,16 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev) > return ERR_PTR(-ENODEV); > } > > + if (pmem_should_map_pages(dev) || nd_pfn || nd_dax) { > + struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); > + resource_size_t start = nsio->res.start; > + > + if (!IS_ALIGNED(start | size, memremap_compat_align())) { > + dev_dbg(&ndns->dev, "misaligned, unable to map\n"); > + return ERR_PTR(-EOPNOTSUPP); > + } > + } > + > if (is_namespace_pmem(&ndns->dev)) { > struct nd_namespace_pmem *nspm; > > _______________________________________________ > Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org > To unsubscribe send an email to linux-nvdimm-leave@lists.01.org