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From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@lists.01.org
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	hch@lst.de, linux-kernel@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 3/5] libnvdimm/namespace: Enforce memremap_compat_align()
Date: Thu, 30 Jan 2020 12:06:13 -0800
Message-ID: <158041477336.3889308.4581652885008605170.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <158041475480.3889308.655103391935006598.stgit@dwillia2-desk3.amr.corp.intel.com>

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.

Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 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;
 
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  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-30 20:05 [PATCH 0/5] libnvdimm: Cross-arch compatible namespace alignment Dan Williams
2020-01-30 20:06 ` [PATCH 1/5] mm/memremap_pages: Kill unused __devm_memremap_pages() Dan Williams
2020-01-31  5:32   ` Christoph Hellwig
2020-02-03 17:08   ` Aneesh Kumar K.V
2020-01-30 20:06 ` [PATCH 2/5] mm/memremap_pages: Introduce memremap_compat_align() Dan Williams
2020-02-03 17:09   ` Aneesh Kumar K.V
2020-02-05  3:05   ` Michael Ellerman
2020-02-06  5:51     ` Dan Williams
2020-02-06  6:21       ` Aneesh Kumar K.V
2020-01-30 20:06 ` Dan Williams [this message]
2020-02-03 17:09   ` [PATCH 3/5] libnvdimm/namespace: Enforce memremap_compat_align() Aneesh Kumar K.V
2020-01-30 20:06 ` [PATCH 4/5] libnvdimm/region: Introduce NDD_LABELING Dan Williams
2020-02-03 17:09   ` Aneesh Kumar K.V
2020-01-30 20:06 ` [PATCH 5/5] libnvdimm/region: Introduce an 'align' attribute Dan Williams
2020-02-03 17:10   ` Aneesh Kumar K.V

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