diff options
Diffstat (limited to 'drivers/nvdimm/btt_devs.c')
| -rw-r--r-- | drivers/nvdimm/btt_devs.c | 54 |
1 files changed, 49 insertions, 5 deletions
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c index 4c989bb9a8a0..3e359d282f8e 100644 --- a/drivers/nvdimm/btt_devs.c +++ b/drivers/nvdimm/btt_devs.c @@ -260,20 +260,55 @@ bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) } EXPORT_SYMBOL(nd_btt_arena_is_valid); +int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns, + struct btt_sb *btt_sb) +{ + if (ndns->claim_class == NVDIMM_CCLASS_BTT2) { + /* Probe/setup for BTT v2.0 */ + nd_btt->initial_offset = 0; + nd_btt->version_major = 2; + nd_btt->version_minor = 0; + if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0)) + return -ENXIO; + if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) + return -ENODEV; + if ((le16_to_cpu(btt_sb->version_major) != 2) || + (le16_to_cpu(btt_sb->version_minor) != 0)) + return -ENODEV; + } else { + /* + * Probe/setup for BTT v1.1 (NVDIMM_CCLASS_NONE or + * NVDIMM_CCLASS_BTT) + */ + nd_btt->initial_offset = SZ_4K; + nd_btt->version_major = 1; + nd_btt->version_minor = 1; + if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0)) + return -ENXIO; + if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) + return -ENODEV; + if ((le16_to_cpu(btt_sb->version_major) != 1) || + (le16_to_cpu(btt_sb->version_minor) != 1)) + return -ENODEV; + } + return 0; +} +EXPORT_SYMBOL(nd_btt_version); + static int __nd_btt_probe(struct nd_btt *nd_btt, struct nd_namespace_common *ndns, struct btt_sb *btt_sb) { + int rc; + if (!btt_sb || !ndns || !nd_btt) return -ENODEV; - if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0)) - return -ENXIO; - if (nvdimm_namespace_capacity(ndns) < SZ_16M) return -ENXIO; - if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) - return -ENODEV; + rc = nd_btt_version(nd_btt, ndns, btt_sb); + if (rc < 0) + return rc; nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize); nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL); @@ -295,6 +330,15 @@ int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns) if (ndns->force_raw) return -ENODEV; + switch (ndns->claim_class) { + case NVDIMM_CCLASS_NONE: + case NVDIMM_CCLASS_BTT: + case NVDIMM_CCLASS_BTT2: + break; + default: + return -ENODEV; + } + nvdimm_bus_lock(&ndns->dev); btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns); nvdimm_bus_unlock(&ndns->dev); |