[PATCH v3 3/6] libnvdimm/namespace: Validate namespace size when creating new namespace.

["Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>]

Architectures like ppc64 use different page size than PAGE_SIZE to map
direct-map address range. The kernel needs to make sure the namespace size is aligned
correctly for the direct-map page size.

kernel log will contain the below details
[  939.620064] nd namespace0.3: 1071644672 is not 16384K aligned

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
 drivers/nvdimm/namespace_devs.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 0751fd4b7d4a..8567d8969014 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -891,6 +891,17 @@ static int grow_dpa_allocation(struct nd_region *nd_region,
 	return 0;
 }
 
+static unsigned long nvdimm_validate_namespace_size(struct nd_region *nd_region,
+		unsigned long size, unsigned long align_size)
+{
+	u32 remainder;
+
+	div_u64_rem(size, align_size * nd_region->ndr_mappings, &remainder);
+	if (remainder)
+		return align_size * nd_region->ndr_mappings;
+	return 0;
+}
+
 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 		struct nd_namespace_pmem *nspm, resource_size_t size)
 {
@@ -949,7 +960,8 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
 	struct nd_mapping *nd_mapping;
 	struct nvdimm_drvdata *ndd;
 	struct nd_label_id label_id;
-	u32 flags = 0, remainder;
+	unsigned long map_size;
+	u32 flags = 0;
 	int rc, i, id = -1;
 	u8 *uuid = NULL;
 
@@ -980,10 +992,9 @@ static ssize_t __size_store(struct device *dev, unsigned long long val)
 		return -ENXIO;
 	}
 
-	div_u64_rem(val, PAGE_SIZE * nd_region->ndr_mappings, &remainder);
-	if (remainder) {
-		dev_dbg(dev, "%llu is not %ldK aligned\n", val,
-				(PAGE_SIZE * nd_region->ndr_mappings) / SZ_1K);
+	map_size = nvdimm_validate_namespace_size(nd_region, val, arch_namespace_align_size());
+	if (map_size) {
+		dev_err(dev, "%llu is not %ldK aligned\n", val, map_size / SZ_1K);
 		return -EINVAL;
 	}
 
-- 
2.24.1
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