Commit c12c48ce authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm, label: add v1.2 interleave-set-cookie algorithm 



The interleave-set-cookie algorithm is extended to incorporate all the
same components that are used to generate an nvdimm unique-id. For
backwards compatibility we still maintain the old v1.1 definition.

Reported-by: default avatarNicholas Moulin <nicholas.w.moulin@intel.com>
Reported-by: default avatarKaushik Kanetkar <kaushik.a.kanetkar@intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 564e871a

drivers/acpi/nfit/core.c

+51 −2
Original line number Diff line number Diff line
@@ -1663,12 +1663,29 @@ struct nfit_set_info { 
	} mapping[0];

};



struct nfit_set_info2 {

	struct nfit_set_info_map2 {

		u64 region_offset;

		u32 serial_number;

		u16 vendor_id;

		u16 manufacturing_date;

		u8  manufacturing_location;

		u8  reserved[31];

	} mapping[0];

};



static size_t sizeof_nfit_set_info(int num_mappings)

{

	return sizeof(struct nfit_set_info)

		+ num_mappings * sizeof(struct nfit_set_info_map);

}



static size_t sizeof_nfit_set_info2(int num_mappings)

{

	return sizeof(struct nfit_set_info2)

		+ num_mappings * sizeof(struct nfit_set_info_map2);

}



static int cmp_map_compat(const void *m0, const void *m1)

{

	const struct nfit_set_info_map *map0 = m0;
@@ -1690,6 +1707,18 @@ static int cmp_map(const void *m0, const void *m1) 
	return 0;

}



static int cmp_map2(const void *m0, const void *m1)

{

	const struct nfit_set_info_map2 *map0 = m0;

	const struct nfit_set_info_map2 *map1 = m1;



	if (map0->region_offset < map1->region_offset)

		return -1;

	else if (map0->region_offset > map1->region_offset)

		return 1;

	return 0;

}



/* Retrieve the nth entry referencing this spa */

static struct acpi_nfit_memory_map *memdev_from_spa(

		struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
@@ -1711,6 +1740,7 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc, 
	struct device *dev = acpi_desc->dev;

	struct nd_interleave_set *nd_set;

	u16 nr = ndr_desc->num_mappings;

	struct nfit_set_info2 *info2;

	struct nfit_set_info *info;



	if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
@@ -1725,9 +1755,15 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc, 
	info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);

	if (!info)

		return -ENOMEM;



	info2 = devm_kzalloc(dev, sizeof_nfit_set_info2(nr), GFP_KERNEL);

	if (!info2)

		return -ENOMEM;



	for (i = 0; i < nr; i++) {

		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];

		struct nfit_set_info_map *map = &info->mapping[i];

		struct nfit_set_info_map2 *map2 = &info2->mapping[i];

		struct nvdimm *nvdimm = mapping->nvdimm;

		struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);

		struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
@@ -1740,19 +1776,32 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc, 


		map->region_offset = memdev->region_offset;

		map->serial_number = nfit_mem->dcr->serial_number;



		map2->region_offset = memdev->region_offset;

		map2->serial_number = nfit_mem->dcr->serial_number;

		map2->vendor_id = nfit_mem->dcr->vendor_id;

		map2->manufacturing_date = nfit_mem->dcr->manufacturing_date;

		map2->manufacturing_location = nfit_mem->dcr->manufacturing_location;

	}



	/* v1.1 namespaces */

	sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),

			cmp_map, NULL);

	nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);

	nd_set->cookie1 = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);



	/* v1.2 namespaces */

	sort(&info2->mapping[0], nr, sizeof(struct nfit_set_info_map2),

			cmp_map2, NULL);

	nd_set->cookie2 = nd_fletcher64(info2, sizeof_nfit_set_info2(nr), 0);



	/* support namespaces created with the wrong sort order */

	/* support v1.1 namespaces created with the wrong sort order */

	sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),

			cmp_map_compat, NULL);

	nd_set->altcookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);



	ndr_desc->nd_set = nd_set;

	devm_kfree(dev, info);

	devm_kfree(dev, info2);



	return 0;

}

drivers/nvdimm/label.c

+2 −1
Original line number Diff line number Diff line
@@ -553,7 +553,6 @@ static int __pmem_label_update(struct nd_region *nd_region, 
		struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,

		int pos)

{

	u64 cookie = nd_region_interleave_set_cookie(nd_region);

	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);

	struct nd_label_ent *label_ent, *victim = NULL;

	struct nd_namespace_label *nd_label;
@@ -563,11 +562,13 @@ static int __pmem_label_update(struct nd_region *nd_region, 
	unsigned long *free;

	u32 nslot, slot;

	size_t offset;

	u64 cookie;

	int rc;



	if (!preamble_next(ndd, &nsindex, &free, &nslot))

		return -ENXIO;



	cookie = nd_region_interleave_set_cookie(nd_region, nsindex);

	nd_label_gen_id(&label_id, nspm->uuid, 0);

	for_each_dpa_resource(ndd, res)

		if (strcmp(res->name, label_id.id) == 0)

drivers/nvdimm/namespace_devs.c

+7 −2
Original line number Diff line number Diff line
@@ -1698,10 +1698,11 @@ static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id) 
 * @nd_label: target pmem namespace label to evaluate

 */

struct device *create_namespace_pmem(struct nd_region *nd_region,

		struct nd_namespace_index *nsindex,

		struct nd_namespace_label *nd_label)

{

	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);

	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);

	u64 cookie = nd_region_interleave_set_cookie(nd_region);

	struct nd_label_ent *label_ent;

	struct nd_namespace_pmem *nspm;

	struct nd_mapping *nd_mapping;
@@ -2108,7 +2109,11 @@ static struct device **scan_labels(struct nd_region *nd_region) 
				goto err;

			devs[count++] = dev;

		} else {

			dev = create_namespace_pmem(nd_region, nd_label);

			struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);

			struct nd_namespace_index *nsindex;



			nsindex = to_namespace_index(ndd, ndd->ns_current);

			dev = create_namespace_pmem(nd_region, nsindex, nd_label);

			if (IS_ERR(dev)) {

				switch (PTR_ERR(dev)) {

				case -EAGAIN:

drivers/nvdimm/nd.h

+2 −1
Original line number Diff line number Diff line
@@ -336,7 +336,8 @@ static inline struct device *nd_dax_create(struct nd_region *nd_region) 
struct nd_region *to_nd_region(struct device *dev);

int nd_region_to_nstype(struct nd_region *nd_region);

int nd_region_register_namespaces(struct nd_region *nd_region, int *err);

u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);

u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,

		struct nd_namespace_index *nsindex);

u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);

void nvdimm_bus_lock(struct device *dev);

void nvdimm_bus_unlock(struct device *dev);

drivers/nvdimm/region_devs.c

+38 −5
Original line number Diff line number Diff line
@@ -307,13 +307,41 @@ static ssize_t set_cookie_show(struct device *dev, 
{

	struct nd_region *nd_region = to_nd_region(dev);

	struct nd_interleave_set *nd_set = nd_region->nd_set;

	ssize_t rc = 0;



	if (is_nd_pmem(dev) && nd_set)

		/* pass, should be precluded by region_visible */;

	else

		return -ENXIO;



	return sprintf(buf, "%#llx\n", nd_set->cookie);

	/*

	 * The cookie to show depends on which specification of the

	 * labels we are using. If there are not labels then default to

	 * the v1.1 namespace label cookie definition. To read all this

	 * data we need to wait for probing to settle.

	 */

	device_lock(dev);

	nvdimm_bus_lock(dev);

	wait_nvdimm_bus_probe_idle(dev);

	if (nd_region->ndr_mappings) {

		struct nd_mapping *nd_mapping = &nd_region->mapping[0];

		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);



		if (ndd) {

			struct nd_namespace_index *nsindex;



			nsindex = to_namespace_index(ndd, ndd->ns_current);

			rc = sprintf(buf, "%#llx\n",

					nd_region_interleave_set_cookie(nd_region,

						nsindex));

		}

	}

	nvdimm_bus_unlock(dev);

	device_unlock(dev);



	if (rc)

		return rc;

	return sprintf(buf, "%#llx\n", nd_set->cookie1);

}

static DEVICE_ATTR_RO(set_cookie);
@@ -564,13 +592,18 @@ struct attribute_group nd_region_attribute_group = { 
};

EXPORT_SYMBOL_GPL(nd_region_attribute_group);



u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)

u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,

		struct nd_namespace_index *nsindex)

{

	struct nd_interleave_set *nd_set = nd_region->nd_set;



	if (nd_set)

		return nd_set->cookie;

	if (!nd_set)

		return 0;



	if (nsindex && __le16_to_cpu(nsindex->major) == 1

			&& __le16_to_cpu(nsindex->minor) == 1)

		return nd_set->cookie1;

	return nd_set->cookie2;

}



u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region)

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