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Subject[PATCH 07/14] libnvdimm, namespace: sort namespaces by dpa at init
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Date
Add more determinism to initial namespace device-name assignments by
sorting the namespaces by starting dpa.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/namespace_devs.c | 35 ++++++++++++++++++++++++++++++++---
include/linux/nd.h | 6 +++---
2 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 47d29632b937..f0536c2789e9 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -12,6 +12,7 @@
*/
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/sort.h>
#include <linux/slab.h>
#include <linux/pmem.h>
#include <linux/list.h>
@@ -66,17 +67,17 @@ static struct device_type namespace_blk_device_type = {
.release = namespace_blk_release,
};

-static bool is_namespace_pmem(struct device *dev)
+static bool is_namespace_pmem(const struct device *dev)
{
return dev ? dev->type == &namespace_pmem_device_type : false;
}

-static bool is_namespace_blk(struct device *dev)
+static bool is_namespace_blk(const struct device *dev)
{
return dev ? dev->type == &namespace_blk_device_type : false;
}

-static bool is_namespace_io(struct device *dev)
+static bool is_namespace_io(const struct device *dev)
{
return dev ? dev->type == &namespace_io_device_type : false;
}
@@ -1919,6 +1920,31 @@ struct device *create_namespace_blk(struct nd_region *nd_region,
return ERR_PTR(-ENXIO);
}

+static int cmp_dpa(const void *a, const void *b)
+{
+ const struct device *dev_a = *(const struct device **) a;
+ const struct device *dev_b = *(const struct device **) b;
+ struct nd_namespace_blk *nsblk_a, *nsblk_b;
+ struct nd_namespace_pmem *nspm_a, *nspm_b;
+
+ if (is_namespace_io(dev_a))
+ return 0;
+
+ if (is_namespace_blk(dev_a)) {
+ nsblk_a = to_nd_namespace_blk(dev_a);
+ nsblk_b = to_nd_namespace_blk(dev_b);
+
+ return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
+ sizeof(resource_size_t));
+ }
+
+ nspm_a = to_nd_namespace_pmem(dev_a);
+ nspm_b = to_nd_namespace_pmem(dev_b);
+
+ return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
+ sizeof(resource_size_t));
+}
+
static struct device **scan_labels(struct nd_region *nd_region)
{
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
@@ -2034,6 +2060,9 @@ static struct device **scan_labels(struct nd_region *nd_region)
}
}

+ if (count > 1)
+ sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
+
return devs;

err:
diff --git a/include/linux/nd.h b/include/linux/nd.h
index ddcc7788305c..fa66aeed441a 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -107,19 +107,19 @@ struct nd_namespace_blk {
struct resource **res;
};

-static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
+static inline struct nd_namespace_io *to_nd_namespace_io(const struct device *dev)
{
return container_of(dev, struct nd_namespace_io, common.dev);
}

-static inline struct nd_namespace_pmem *to_nd_namespace_pmem(struct device *dev)
+static inline struct nd_namespace_pmem *to_nd_namespace_pmem(const struct device *dev)
{
struct nd_namespace_io *nsio = to_nd_namespace_io(dev);

return container_of(nsio, struct nd_namespace_pmem, nsio);
}

-static inline struct nd_namespace_blk *to_nd_namespace_blk(struct device *dev)
+static inline struct nd_namespace_blk *to_nd_namespace_blk(const struct device *dev)
{
return container_of(dev, struct nd_namespace_blk, common.dev);
}
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