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
......@@ -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;
}
......
......@@ -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)
......
......@@ -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:
......
......@@ -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);
......
......@@ -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;
return 0;
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)
......
......@@ -71,7 +71,10 @@ struct nd_cmd_desc {
};
struct nd_interleave_set {
u64 cookie;
/* v1.1 definition of the interleave-set-cookie algorithm */
u64 cookie1;
/* v1.2 definition of the interleave-set-cookie algorithm */
u64 cookie2;
/* compatibility with initial buggy Linux implementation */
u64 altcookie;
};
......
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