* [PATCH v2 2/6] libnvdimm/namespace: Validate namespace start addr and size
2019-11-28 8:30 [PATCH v2 1/6] libnvdimm/namespace: Make namespace size validation arch dependent Aneesh Kumar K.V
@ 2019-11-28 8:30 ` Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 3/6] libnvdimm/namespace: Validate namespace size when creating new namespace Aneesh Kumar K.V
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2019-11-28 8:30 UTC (permalink / raw)
To: dan.j.williams; +Cc: linux-nvdimm, Aneesh Kumar K.V
Make sure namespace start addr and size are properly aligned as per architecture
restrictions. If the namespace is not aligned we mark the namespace 'disabled'
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 information as below.
[ 5.810939] nd_pmem namespace0.1: invalid size/SPA
[ 5.810969] nd_pmem: probe of namespace0.1 failed with error -95
and the namespace will be marked 'disabled'
{
"dev":"namespace0.1",
"mode":"fsdax",
"map":"mem",
"size":1071644672,
"uuid":"25577a00-c012-421d-89ca-3ee189e08848",
"sector_size":512,
"state":"disabled"
},
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
drivers/nvdimm/namespace_devs.c | 39 +++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index cca0a3ba1d2c..d77d9c9e449d 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1139,6 +1139,40 @@ resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
}
EXPORT_SYMBOL(nvdimm_namespace_capacity);
+static bool nvdimm_valid_namespace(struct nd_namespace_common *ndns, resource_size_t size)
+{
+ struct device *dev = &ndns->dev;
+ struct nd_region *nd_region = to_nd_region(dev->parent);
+ unsigned long align_size = arch_namespace_align_size();
+ struct resource *res;
+ u32 remainder;
+
+ if (is_namespace_blk(dev))
+ return true;
+
+ div_u64_rem(size, align_size * nd_region->ndr_mappings, &remainder);
+ if (remainder)
+ return false;
+
+ if (is_namespace_pmem(dev)) {
+ struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
+
+ res = &nspm->nsio.res;
+ } else if (is_namespace_io(dev)) {
+ struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
+
+ res = &nsio->res;
+ } else
+ /* cannot reach */
+ return false;
+
+ div_u64_rem(res->start, align_size * nd_region->ndr_mappings, &remainder);
+ if (remainder)
+ return false;
+
+ return true;
+}
+
bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
{
int i;
@@ -1735,6 +1769,11 @@ struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
return ERR_PTR(-ENODEV);
}
+ if (!nvdimm_valid_namespace(ndns, size)) {
+ dev_err(&ndns->dev, "invalid size/SPA");
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
if (is_namespace_pmem(&ndns->dev)) {
struct nd_namespace_pmem *nspm;
--
2.23.0
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* [PATCH v2 3/6] libnvdimm/namespace: Validate namespace size when creating new namespace.
2019-11-28 8:30 [PATCH v2 1/6] libnvdimm/namespace: Make namespace size validation arch dependent Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 2/6] libnvdimm/namespace: Validate namespace start addr and size Aneesh Kumar K.V
@ 2019-11-28 8:30 ` Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 4/6] libnvdimm/namespace: Add debug check while initializing namespace resource size Aneesh Kumar K.V
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2019-11-28 8:30 UTC (permalink / raw)
To: dan.j.williams; +Cc: linux-nvdimm, Aneesh Kumar K.V
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 d77d9c9e449d..0e4c04765cb8 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -917,6 +917,17 @@ 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)
{
@@ -975,7 +986,8 @@ 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;
@@ -1006,10 +1018,9 @@ 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;
}
--
2.23.0
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* [PATCH v2 4/6] libnvdimm/namespace: Add debug check while initializing namespace resource size.
2019-11-28 8:30 [PATCH v2 1/6] libnvdimm/namespace: Make namespace size validation arch dependent Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 2/6] libnvdimm/namespace: Validate namespace start addr and size Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 3/6] libnvdimm/namespace: Validate namespace size when creating new namespace Aneesh Kumar K.V
@ 2019-11-28 8:30 ` Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 5/6] libnvdimm/namespace: Align DPA based on arch restrictions Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 6/6] libnvdimm/namespace: Expose arch specific supported size align value Aneesh Kumar K.V
4 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2019-11-28 8:30 UTC (permalink / raw)
To: dan.j.williams; +Cc: linux-nvdimm, Aneesh Kumar K.V
This should enable us to catch if we are initializing the namespace with a wrong
size.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
drivers/nvdimm/namespace_devs.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 0e4c04765cb8..06b55c41660d 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -967,6 +967,18 @@ static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
out:
res->start = nd_region->ndr_start + offset;
res->end = res->start + size - 1;
+#ifdef CONFIG_DEBUG_VM
+ if (size) {
+ unsigned long map_size;
+
+ map_size = nvdimm_validate_namespace_size(nd_region, size, arch_namespace_align_size());
+ WARN_ON(map_size);
+
+ map_size = nvdimm_validate_namespace_size(nd_region, res->start, arch_namespace_align_size());
+ WARN_ON(map_size);
+
+ }
+#endif
}
static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
--
2.23.0
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* [PATCH v2 5/6] libnvdimm/namespace: Align DPA based on arch restrictions
2019-11-28 8:30 [PATCH v2 1/6] libnvdimm/namespace: Make namespace size validation arch dependent Aneesh Kumar K.V
` (2 preceding siblings ...)
2019-11-28 8:30 ` [PATCH v2 4/6] libnvdimm/namespace: Add debug check while initializing namespace resource size Aneesh Kumar K.V
@ 2019-11-28 8:30 ` Aneesh Kumar K.V
2019-11-28 8:30 ` [PATCH v2 6/6] libnvdimm/namespace: Expose arch specific supported size align value Aneesh Kumar K.V
4 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2019-11-28 8:30 UTC (permalink / raw)
To: dan.j.williams; +Cc: linux-nvdimm, Aneesh Kumar K.V
When creating new namespace make sure DPA address are properly aligned based
on arch restrictions.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
drivers/nvdimm/namespace_devs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 06b55c41660d..6a83db9f8734 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -589,6 +589,8 @@ static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
return;
}
+ valid->start = ALIGN(valid->start, arch_namespace_align_size());
+
/* allocation needs to be contiguous, so this is all or nothing */
if (resource_size(valid) < n)
goto invalid;
--
2.23.0
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* [PATCH v2 6/6] libnvdimm/namespace: Expose arch specific supported size align value
2019-11-28 8:30 [PATCH v2 1/6] libnvdimm/namespace: Make namespace size validation arch dependent Aneesh Kumar K.V
` (3 preceding siblings ...)
2019-11-28 8:30 ` [PATCH v2 5/6] libnvdimm/namespace: Align DPA based on arch restrictions Aneesh Kumar K.V
@ 2019-11-28 8:30 ` Aneesh Kumar K.V
4 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2019-11-28 8:30 UTC (permalink / raw)
To: dan.j.williams; +Cc: linux-nvdimm, Aneesh Kumar K.V
Expose supported size align as a namespace RO attribute. Usespace can use this
to validate the size argument specified when creating a new namespace.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
drivers/nvdimm/namespace_devs.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 6a83db9f8734..22c714469f87 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1684,6 +1684,14 @@ static ssize_t force_raw_show(struct device *dev,
}
static DEVICE_ATTR_RW(force_raw);
+static ssize_t supported_size_align_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%ld\n", arch_namespace_align_size());
+}
+static DEVICE_ATTR_RO(supported_size_align);
+
+
static struct attribute *nd_namespace_attributes[] = {
&dev_attr_nstype.attr,
&dev_attr_size.attr,
@@ -1696,6 +1704,7 @@ static struct attribute *nd_namespace_attributes[] = {
&dev_attr_sector_size.attr,
&dev_attr_dpa_extents.attr,
&dev_attr_holder_class.attr,
+ &dev_attr_supported_size_align.attr,
NULL,
};
--
2.23.0
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