static int is_uuid_busy(struct device *dev, void *data)
{
u8 *uuid1 = data, *uuid2 = NULL;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
uuid2 = nspm->uuid;
} else if (is_namespace_blk(dev)) {
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
uuid2 = nsblk->uuid;
} else if (is_nd_btt(dev)) {
struct nd_btt *nd_btt = to_nd_btt(dev);
uuid2 = nd_btt->uuid;
} else if (is_nd_pfn(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
uuid2 = nd_pfn->uuid;
}
if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
return -EBUSY;
return 0;
}
struct nd_pfn *to_nd_pfn(struct device *dev)
{
struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev);
WARN_ON(!is_nd_pfn(dev));
return nd_pfn;
}
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
char *name)
{
struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
const char *suffix = NULL;
if (ndns->claim) {
if (is_nd_btt(ndns->claim))
suffix = "s";
else if (is_nd_pfn(ndns->claim))
suffix = "m";
else
dev_WARN_ONCE(&ndns->dev, 1,
"unknown claim type by %s\n",
dev_name(ndns->claim));
}
if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
if (!suffix && pmem_should_map_pages(&ndns->dev))
suffix = "m";
sprintf(name, "pmem%d%s", nd_region->id, suffix ? suffix : "");
} else if (is_namespace_blk(&ndns->dev)) {
struct nd_namespace_blk *nsblk;
nsblk = to_nd_namespace_blk(&ndns->dev);
sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
suffix ? suffix : "");
} else {
return NULL;
}
return name;
}
static int nd_pmem_remove(struct device *dev)
{
struct pmem_device *pmem = dev_get_drvdata(dev);
if (is_nd_btt(dev))
nvdimm_namespace_detach_btt(pmem->ndns);
else if (is_nd_pfn(dev))
nvdimm_namespace_detach_pfn(pmem->ndns);
else
pmem_detach_disk(pmem);
return 0;
}
static bool is_idle(struct device *dev, struct nd_namespace_common *ndns)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct device *seed = NULL;
if (is_nd_btt(dev))
seed = nd_region->btt_seed;
else if (is_nd_pfn(dev))
seed = nd_region->pfn_seed;
else if (is_nd_dax(dev))
seed = nd_region->dax_seed;
if (seed == dev || ndns || dev->driver)
return false;
return true;
}
struct nd_pfn *to_nd_pfn_safe(struct device *dev)
{
/*
* pfn device attributes are re-used by dax device instances, so we
* need to be careful to correct device-to-nd_pfn conversion.
*/
if (is_nd_pfn(dev))
return to_nd_pfn(dev);
if (is_nd_dax(dev)) {
struct nd_dax *nd_dax = to_nd_dax(dev);
return &nd_dax->nd_pfn;
}
WARN_ON(1);
return NULL;
}
bool pmem_should_map_pages(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
return false;
if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
return false;
if (is_nd_pfn(dev) || is_nd_btt(dev))
return false;
#ifdef ARCH_MEMREMAP_PMEM
return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
#else
return false;
#endif
}
static void nd_detach_and_reset(struct device *dev,
struct nd_namespace_common **_ndns)
{
/* detach the namespace and destroy / reset the device */
nd_detach_ndns(dev, _ndns);
if (is_idle(dev, *_ndns)) {
nd_device_unregister(dev, ND_ASYNC);
} else if (is_nd_btt(dev)) {
struct nd_btt *nd_btt = to_nd_btt(dev);
nd_btt->lbasize = 0;
kfree(nd_btt->uuid);
nd_btt->uuid = NULL;
} else if (is_nd_pfn(dev) || is_nd_dax(dev)) {
struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
kfree(nd_pfn->uuid);
nd_pfn->uuid = NULL;
nd_pfn->mode = PFN_MODE_NONE;
}
}
static int nd_pmem_probe(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_namespace_common *ndns;
struct nd_namespace_io *nsio;
struct pmem_device *pmem;
ndns = nvdimm_namespace_common_probe(dev);
if (IS_ERR(ndns))
return PTR_ERR(ndns);
nsio = to_nd_namespace_io(&ndns->dev);
pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
if (IS_ERR(pmem))
return PTR_ERR(pmem);
pmem->ndns = ndns;
dev_set_drvdata(dev, pmem);
ndns->rw_bytes = pmem_rw_bytes;
if (is_nd_btt(dev))
return nvdimm_namespace_attach_btt(ndns);
if (is_nd_pfn(dev))
return nvdimm_namespace_attach_pfn(ndns);
if (nd_btt_probe(ndns, pmem) == 0) {
/* we'll come back as btt-pmem */
return -ENXIO;
}
if (nd_pfn_probe(ndns, pmem) == 0) {
/* we'll come back as pfn-pmem */
return -ENXIO;
}
return pmem_attach_disk(dev, ndns, pmem);
}
