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Commit 1b40e09a authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm: blk labels and namespace instantiation 



A blk label set describes a namespace comprised of one or more
discontiguous dpa ranges on a single dimm.  They may alias with one or
more pmem interleave sets that include the given dimm.

This is the runtime/volatile configuration infrastructure for sysfs
manipulation of 'alt_name', 'uuid', 'size', and 'sector_size'.  A later
patch will make these settings persistent by writing back the label(s).

Unlike pmem namespaces, multiple blk namespaces can be created per
region.  Once a blk namespace has been created a new seed device
(unconfigured child of a parent blk region) is instantiated.  As long as
a region has 'available_size' != 0 new child namespaces may be created.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Neil Brown <neilb@suse.de>
Acked-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent bf9bccc1

drivers/nvdimm/core.c

+40 −0
Original line number Diff line number Diff line
@@ -173,6 +173,46 @@ int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf, 
	return 0;

}



ssize_t nd_sector_size_show(unsigned long current_lbasize,

		const unsigned long *supported, char *buf)

{

	ssize_t len = 0;

	int i;



	for (i = 0; supported[i]; i++)

		if (current_lbasize == supported[i])

			len += sprintf(buf + len, "[%ld] ", supported[i]);

		else

			len += sprintf(buf + len, "%ld ", supported[i]);

	len += sprintf(buf + len, "\n");

	return len;

}



ssize_t nd_sector_size_store(struct device *dev, const char *buf,

		unsigned long *current_lbasize, const unsigned long *supported)

{

	unsigned long lbasize;

	int rc, i;



	if (dev->driver)

		return -EBUSY;



	rc = kstrtoul(buf, 0, &lbasize);

	if (rc)

		return rc;



	for (i = 0; supported[i]; i++)

		if (lbasize == supported[i])

			break;



	if (supported[i]) {

		*current_lbasize = lbasize;

		return 0;

	} else {

		return -EINVAL;

	}

}



static ssize_t commands_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

drivers/nvdimm/dimm_devs.c

+36 −0
Original line number Diff line number Diff line
@@ -289,6 +289,42 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data, 
}

EXPORT_SYMBOL_GPL(nvdimm_create);



/**

 * nd_blk_available_dpa - account the unused dpa of BLK region

 * @nd_mapping: container of dpa-resource-root + labels

 *

 * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges.

 */

resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping)

{

	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);

	resource_size_t map_end, busy = 0, available;

	struct resource *res;



	if (!ndd)

		return 0;



	map_end = nd_mapping->start + nd_mapping->size - 1;

	for_each_dpa_resource(ndd, res)

		if (res->start >= nd_mapping->start && res->start < map_end) {

			resource_size_t end = min(map_end, res->end);



			busy += end - res->start + 1;

		} else if (res->end >= nd_mapping->start

				&& res->end <= map_end) {

			busy += res->end - nd_mapping->start;

		} else if (nd_mapping->start > res->start

				&& nd_mapping->start < res->end) {

			/* total eclipse of the BLK region mapping */

			busy += nd_mapping->size;

		}



	available = map_end - nd_mapping->start + 1;

	if (busy < available)

		return available - busy;

	return 0;

}



/**

 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa

 * @nd_mapping: container of dpa-resource-root + labels

drivers/nvdimm/namespace_devs.c

+462 −36

File changed.

Preview size limit exceeded, changes collapsed.

drivers/nvdimm/nd-core.h

+8 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/libnvdimm.h>

#include <linux/sizes.h>

#include <linux/mutex.h>

#include <linux/nd.h>



extern struct list_head nvdimm_bus_list;

extern struct mutex nvdimm_bus_list_mutex;
@@ -48,6 +49,8 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev); 
int __init nvdimm_bus_init(void);

void nvdimm_bus_exit(void);

void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);

struct nd_region;

void nd_region_create_blk_seed(struct nd_region *nd_region);

void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);

int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);

void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
@@ -64,8 +67,13 @@ struct nvdimm_drvdata; 
struct nd_mapping;

resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,

		struct nd_mapping *nd_mapping, resource_size_t *overlap);

resource_size_t nd_blk_available_dpa(struct nd_mapping *nd_mapping);

resource_size_t nd_region_available_dpa(struct nd_region *nd_region);

resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,

		struct nd_label_id *label_id);

struct nd_mapping;

struct resource *nsblk_add_resource(struct nd_region *nd_region,

		struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,

		resource_size_t start);

void get_ndd(struct nvdimm_drvdata *ndd);

#endif /* __ND_CORE_H__ */

drivers/nvdimm/nd.h

+5 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ static inline struct nd_namespace_index *to_next_namespace_index( 


struct nd_region {

	struct device dev;

	struct ida ns_ida;

	struct device *ns_seed;

	u16 ndr_mappings;

	u64 ndr_size;
@@ -102,6 +103,10 @@ void nd_device_register(struct device *dev); 
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);

int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,

		size_t len);

ssize_t nd_sector_size_show(unsigned long current_lbasize,

		const unsigned long *supported, char *buf);

ssize_t nd_sector_size_store(struct device *dev, const char *buf,

		unsigned long *current_lbasize, const unsigned long *supported);

int __init nvdimm_init(void);

int __init nd_region_init(void);

void nvdimm_exit(void);