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libnvdimm/labels: Introduce CXL labels 

Now that all of use sites of label data have been converted to nsl_*
helpers, introduce the CXL label format. The ->cxl flag in
nvdimm_drvdata indicates the label format the device expects. A
follow-on patch allows a bus provider to select the label style.

Note that the EFI definition of the labels represents the Linux "claim
class" with a GUID. The CXL definition of the labels stores the same
identifier in UUID byte order.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116432405.2460985.5547867384570123403.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-09-08 22:12:04 -07:00
parent 540ccaa2e4
commit 5af96835e4
3 changed files with 241 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
drivers/nvdimm/label.c
View File

@ -17,6 +17,14 @@ static guid_t nvdimm_btt2_guid;
static guid_t nvdimm_pfn_guid;
static guid_t nvdimm_dax_guid;
static uuid_t nvdimm_btt_uuid;
static uuid_t nvdimm_btt2_uuid;
static uuid_t nvdimm_pfn_uuid;
static uuid_t nvdimm_dax_uuid;
static uuid_t cxl_region_uuid;
static uuid_t cxl_namespace_uuid;
static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
static u32 best_seq(u32 a, u32 b)
@ -352,7 +360,7 @@ static bool nsl_validate_checksum(struct nvdimm_drvdata *ndd,
{
u64 sum, sum_save;
if (!namespace_label_has(ndd, checksum))
if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
return true;
sum_save = nsl_get_checksum(ndd, nd_label);
@ -367,7 +375,7 @@ static void nsl_calculate_checksum(struct nvdimm_drvdata *ndd,
{
u64 sum;
if (!namespace_label_has(ndd, checksum))
if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
return;
nsl_set_checksum(ndd, nd_label, 0);
sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
@ -725,7 +733,7 @@ static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
- (unsigned long) to_namespace_index(ndd, 0);
}
static enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
static enum nvdimm_claim_class guid_to_nvdimm_cclass(guid_t *guid)
{
if (guid_equal(guid, &nvdimm_btt_guid))
return NVDIMM_CCLASS_BTT;
@ -741,6 +749,23 @@ static enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid)
return NVDIMM_CCLASS_UNKNOWN;
}
/* CXL labels store UUIDs instead of GUIDs for the same data */
static enum nvdimm_claim_class uuid_to_nvdimm_cclass(uuid_t *uuid)
{
if (uuid_equal(uuid, &nvdimm_btt_uuid))
return NVDIMM_CCLASS_BTT;
else if (uuid_equal(uuid, &nvdimm_btt2_uuid))
return NVDIMM_CCLASS_BTT2;
else if (uuid_equal(uuid, &nvdimm_pfn_uuid))
return NVDIMM_CCLASS_PFN;
else if (uuid_equal(uuid, &nvdimm_dax_uuid))
return NVDIMM_CCLASS_DAX;
else if (uuid_equal(uuid, &uuid_null))
return NVDIMM_CCLASS_NONE;
return NVDIMM_CCLASS_UNKNOWN;
}
static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
guid_t *target)
{
@ -762,6 +787,28 @@ static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class,
return &guid_null;
}
/* CXL labels store UUIDs instead of GUIDs for the same data */
static const uuid_t *to_abstraction_uuid(enum nvdimm_claim_class claim_class,
uuid_t *target)
{
if (claim_class == NVDIMM_CCLASS_BTT)
return &nvdimm_btt_uuid;
else if (claim_class == NVDIMM_CCLASS_BTT2)
return &nvdimm_btt2_uuid;
else if (claim_class == NVDIMM_CCLASS_PFN)
return &nvdimm_pfn_uuid;
else if (claim_class == NVDIMM_CCLASS_DAX)
return &nvdimm_dax_uuid;
else if (claim_class == NVDIMM_CCLASS_UNKNOWN) {
/*
* If we're modifying a namespace for which we don't
* know the claim_class, don't touch the existing uuid.
*/
return target;
} else
return &uuid_null;
}
static void reap_victim(struct nd_mapping *nd_mapping,
struct nd_label_ent *victim)
{
@ -776,18 +823,18 @@ static void reap_victim(struct nd_mapping *nd_mapping,
static void nsl_set_type_guid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, guid_t *guid)
{
if (namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->type_guid, guid);
if (efi_namespace_label_has(ndd, type_guid))
guid_copy(&nd_label->efi.type_guid, guid);
}
bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, guid_t *guid)
{
if (!namespace_label_has(ndd, type_guid))
if (ndd->cxl || !efi_namespace_label_has(ndd, type_guid))
return true;
if (!guid_equal(&nd_label->type_guid, guid)) {
if (!guid_equal(&nd_label->efi.type_guid, guid)) {
dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n", guid,
&nd_label->type_guid);
&nd_label->efi.type_guid);
return false;
}
return true;
@ -797,19 +844,34 @@ static void nsl_set_claim_class(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
enum nvdimm_claim_class claim_class)
{
if (!namespace_label_has(ndd, abstraction_guid))
if (ndd->cxl) {
uuid_t uuid;
import_uuid(&uuid, nd_label->cxl.abstraction_uuid);
export_uuid(nd_label->cxl.abstraction_uuid,
to_abstraction_uuid(claim_class, &uuid));
return;
guid_copy(&nd_label->abstraction_guid,
}
if (!efi_namespace_label_has(ndd, abstraction_guid))
return;
guid_copy(&nd_label->efi.abstraction_guid,
to_abstraction_guid(claim_class,
&nd_label->abstraction_guid));
&nd_label->efi.abstraction_guid));
}
enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
if (!namespace_label_has(ndd, abstraction_guid))
if (ndd->cxl) {
uuid_t uuid;
import_uuid(&uuid, nd_label->cxl.abstraction_uuid);
return uuid_to_nvdimm_cclass(&uuid);
}
if (!efi_namespace_label_has(ndd, abstraction_guid))
return NVDIMM_CCLASS_NONE;
return to_nvdimm_cclass(&nd_label->abstraction_guid);
return guid_to_nvdimm_cclass(&nd_label->efi.abstraction_guid);
}
static int __pmem_label_update(struct nd_region *nd_region,
@ -942,7 +1004,7 @@ static void nsl_set_blk_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 isetcookie)
{
if (namespace_label_has(ndd, type_guid)) {
if (efi_namespace_label_has(ndd, type_guid)) {
nsl_set_isetcookie(ndd, nd_label, isetcookie);
return;
}
@ -953,7 +1015,7 @@ bool nsl_validate_blk_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 isetcookie)
{
if (!namespace_label_has(ndd, type_guid))
if (!efi_namespace_label_has(ndd, type_guid))
return true;
if (nsl_get_isetcookie(ndd, nd_label) != isetcookie) {
@ -969,7 +1031,7 @@ static void nsl_set_blk_nlabel(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, int nlabel,
bool first)
{
if (!namespace_label_has(ndd, type_guid)) {
if (!efi_namespace_label_has(ndd, type_guid)) {
nsl_set_nlabel(ndd, nd_label, 0); /* N/A */
return;
}
@ -980,7 +1042,7 @@ static void nsl_set_blk_position(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
bool first)
{
if (!namespace_label_has(ndd, type_guid)) {
if (!efi_namespace_label_has(ndd, type_guid)) {
nsl_set_position(ndd, nd_label, 0);
return;
}
@ -1390,5 +1452,13 @@ int __init nd_label_init(void)
WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid));
WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid));
WARN_ON(uuid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_uuid));
WARN_ON(uuid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_uuid));
WARN_ON(uuid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_uuid));
WARN_ON(uuid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_uuid));
WARN_ON(uuid_parse(CXL_REGION_UUID, &cxl_region_uuid));
WARN_ON(uuid_parse(CXL_NAMESPACE_UUID, &cxl_namespace_uuid));
return 0;
}

52
drivers/nvdimm/label.h
View File

@ -99,7 +99,7 @@ struct cxl_region_label {
};
/**
* struct nd_namespace_label - namespace superblock
* struct nvdimm_efi_label - namespace superblock
* @uuid: UUID per RFC 4122
* @name: optional name (NULL-terminated)
* @flags: see NSLABEL_FLAG_*
@ -117,7 +117,7 @@ struct cxl_region_label {
* @reserved2: reserved
* @checksum: fletcher64 sum of this object
*/
struct nd_namespace_label {
struct nvdimm_efi_label {
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
@ -130,7 +130,7 @@ struct nd_namespace_label {
__le32 slot;
/*
* Accessing fields past this point should be gated by a
* namespace_label_has() check.
* efi_namespace_label_has() check.
*/
u8 align;
u8 reserved[3];
@ -140,11 +140,57 @@ struct nd_namespace_label {
__le64 checksum;
};
/**
* struct nvdimm_cxl_label - CXL 2.0 Table 212
* @type: uuid identifying this label format (namespace)
* @uuid: uuid for the namespace this label describes
* @name: friendly name for the namespace
* @flags: NSLABEL_FLAG_UPDATING (all other flags reserved)
* @nrange: discontiguous namespace support
* @position: this label's position in the set
* @dpa: start address in device-local capacity for this label
* @rawsize: size of this label's contribution to namespace
* @slot: slot id of this label in label area
* @align: alignment in SZ_256M blocks
* @region_uuid: host interleave set identifier
* @abstraction_uuid: personality driver for this namespace
* @lbasize: address geometry for disk-like personalities
* @reserved: reserved
* @checksum: fletcher64 sum of this label
*/
struct nvdimm_cxl_label {
u8 type[NSLABEL_UUID_LEN];
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
__le16 nrange;
__le16 position;
__le64 dpa;
__le64 rawsize;
__le32 slot;
__le32 align;
u8 region_uuid[16];
u8 abstraction_uuid[16];
__le16 lbasize;
u8 reserved[0x56];
__le64 checksum;
};
struct nd_namespace_label {
union {
struct nvdimm_cxl_label cxl;
struct nvdimm_efi_label efi;
};
};
#define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
#define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8"
#define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
#define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
#define CXL_REGION_UUID "529d7c61-da07-47c4-a93f-ecdf2c06f444"
#define CXL_NAMESPACE_UUID "68bb2c0a-5a77-4937-9f85-3caf41a0f93c"
/**
* struct nd_label_id - identifier string for dpa allocation
* @id: "{blk|pmem}-<namespace uuid>"

135
drivers/nvdimm/nd.h
View File

@ -30,6 +30,7 @@ struct nvdimm_drvdata {
int nslabel_size;
struct nd_cmd_get_config_size nsarea;
void *data;
bool cxl;
int ns_current, ns_next;
struct resource dpa;
struct kref kref;
@ -38,13 +39,17 @@ struct nvdimm_drvdata {
static inline const u8 *nsl_ref_name(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return nd_label->name;
if (ndd->cxl)
return nd_label->cxl.name;
return nd_label->efi.name;
}
static inline u8 *nsl_get_name(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u8 *name)
{
return memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
if (ndd->cxl)
return memcpy(name, nd_label->cxl.name, NSLABEL_NAME_LEN);
return memcpy(name, nd_label->efi.name, NSLABEL_NAME_LEN);
}
static inline u8 *nsl_set_name(struct nvdimm_drvdata *ndd,
@ -52,122 +57,168 @@ static inline u8 *nsl_set_name(struct nvdimm_drvdata *ndd,
{
if (!name)
return NULL;
return memcpy(nd_label->name, name, NSLABEL_NAME_LEN);
if (ndd->cxl)
return memcpy(nd_label->cxl.name, name, NSLABEL_NAME_LEN);
return memcpy(nd_label->efi.name, name, NSLABEL_NAME_LEN);
}
static inline u32 nsl_get_slot(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le32_to_cpu(nd_label->slot);
if (ndd->cxl)
return __le32_to_cpu(nd_label->cxl.slot);
return __le32_to_cpu(nd_label->efi.slot);
}
static inline void nsl_set_slot(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u32 slot)
{
nd_label->slot = __cpu_to_le32(slot);
if (ndd->cxl)
nd_label->cxl.slot = __cpu_to_le32(slot);
else
nd_label->efi.slot = __cpu_to_le32(slot);
}
static inline u64 nsl_get_checksum(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le64_to_cpu(nd_label->checksum);
if (ndd->cxl)
return __le64_to_cpu(nd_label->cxl.checksum);
return __le64_to_cpu(nd_label->efi.checksum);
}
static inline void nsl_set_checksum(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 checksum)
{
nd_label->checksum = __cpu_to_le64(checksum);
if (ndd->cxl)
nd_label->cxl.checksum = __cpu_to_le64(checksum);
else
nd_label->efi.checksum = __cpu_to_le64(checksum);
}
static inline u32 nsl_get_flags(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le32_to_cpu(nd_label->flags);
if (ndd->cxl)
return __le32_to_cpu(nd_label->cxl.flags);
return __le32_to_cpu(nd_label->efi.flags);
}
static inline void nsl_set_flags(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u32 flags)
{
nd_label->flags = __cpu_to_le32(flags);
if (ndd->cxl)
nd_label->cxl.flags = __cpu_to_le32(flags);
else
nd_label->efi.flags = __cpu_to_le32(flags);
}
static inline u64 nsl_get_dpa(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le64_to_cpu(nd_label->dpa);
if (ndd->cxl)
return __le64_to_cpu(nd_label->cxl.dpa);
return __le64_to_cpu(nd_label->efi.dpa);
}
static inline void nsl_set_dpa(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, u64 dpa)
{
nd_label->dpa = __cpu_to_le64(dpa);
if (ndd->cxl)
nd_label->cxl.dpa = __cpu_to_le64(dpa);
else
nd_label->efi.dpa = __cpu_to_le64(dpa);
}
static inline u64 nsl_get_rawsize(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le64_to_cpu(nd_label->rawsize);
if (ndd->cxl)
return __le64_to_cpu(nd_label->cxl.rawsize);
return __le64_to_cpu(nd_label->efi.rawsize);
}
static inline void nsl_set_rawsize(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 rawsize)
{
nd_label->rawsize = __cpu_to_le64(rawsize);
if (ndd->cxl)
nd_label->cxl.rawsize = __cpu_to_le64(rawsize);
else
nd_label->efi.rawsize = __cpu_to_le64(rawsize);
}
static inline u64 nsl_get_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le64_to_cpu(nd_label->isetcookie);
/* WARN future refactor attempts that break this assumption */
if (dev_WARN_ONCE(ndd->dev, ndd->cxl,
"CXL labels do not use the isetcookie concept\n"))
return 0;
return __le64_to_cpu(nd_label->efi.isetcookie);
}
static inline void nsl_set_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 isetcookie)
{
nd_label->isetcookie = __cpu_to_le64(isetcookie);
if (!ndd->cxl)
nd_label->efi.isetcookie = __cpu_to_le64(isetcookie);
}
static inline bool nsl_validate_isetcookie(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 cookie)
{
return cookie == __le64_to_cpu(nd_label->isetcookie);
/*
* Let the EFI and CXL validation comingle, where fields that
* don't matter to CXL always validate.
*/
if (ndd->cxl)
return true;
return cookie == __le64_to_cpu(nd_label->efi.isetcookie);
}
static inline u16 nsl_get_position(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le16_to_cpu(nd_label->position);
if (ndd->cxl)
return __le16_to_cpu(nd_label->cxl.position);
return __le16_to_cpu(nd_label->efi.position);
}
static inline void nsl_set_position(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u16 position)
{
nd_label->position = __cpu_to_le16(position);
if (ndd->cxl)
nd_label->cxl.position = __cpu_to_le16(position);
else
nd_label->efi.position = __cpu_to_le16(position);
}
static inline u16 nsl_get_nlabel(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le16_to_cpu(nd_label->nlabel);
if (ndd->cxl)
return 0;
return __le16_to_cpu(nd_label->efi.nlabel);
}
static inline void nsl_set_nlabel(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u16 nlabel)
{
nd_label->nlabel = __cpu_to_le16(nlabel);
if (!ndd->cxl)
nd_label->efi.nlabel = __cpu_to_le16(nlabel);
}
static inline u16 nsl_get_nrange(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
/* EFI labels do not have an nrange field */
if (ndd->cxl)
return __le16_to_cpu(nd_label->cxl.nrange);
return 1;
}
@ -175,26 +226,40 @@ static inline void nsl_set_nrange(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u16 nrange)
{
if (ndd->cxl)
nd_label->cxl.nrange = __cpu_to_le16(nrange);
}
static inline u64 nsl_get_lbasize(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return __le64_to_cpu(nd_label->lbasize);
/*
* Yes, for some reason the EFI labels convey a massive 64-bit
* lbasize, that got fixed for CXL.
*/
if (ndd->cxl)
return __le16_to_cpu(nd_label->cxl.lbasize);
return __le64_to_cpu(nd_label->efi.lbasize);
}
static inline void nsl_set_lbasize(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
u64 lbasize)
{
nd_label->lbasize = __cpu_to_le64(lbasize);
if (ndd->cxl)
nd_label->cxl.lbasize = __cpu_to_le16(lbasize);
else
nd_label->efi.lbasize = __cpu_to_le64(lbasize);
}
static inline const uuid_t *nsl_get_uuid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
uuid_t *uuid)
{
import_uuid(uuid, nd_label->uuid);
if (ndd->cxl)
import_uuid(uuid, nd_label->cxl.uuid);
else
import_uuid(uuid, nd_label->efi.uuid);
return uuid;
}
@ -202,7 +267,10 @@ static inline const uuid_t *nsl_set_uuid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label,
const uuid_t *uuid)
{
export_uuid(nd_label->uuid, uuid);
if (ndd->cxl)
export_uuid(nd_label->cxl.uuid, uuid);
else
export_uuid(nd_label->efi.uuid, uuid);
return uuid;
}
@ -212,14 +280,19 @@ static inline bool nsl_uuid_equal(struct nvdimm_drvdata *ndd,
{
uuid_t tmp;
import_uuid(&tmp, nd_label->uuid);
if (ndd->cxl)
import_uuid(&tmp, nd_label->cxl.uuid);
else
import_uuid(&tmp, nd_label->efi.uuid);
return uuid_equal(&tmp, uuid);
}
static inline const u8 *nsl_uuid_raw(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
return nd_label->uuid;
if (ndd->cxl)
return nd_label->cxl.uuid;
return nd_label->efi.uuid;
}
bool nsl_validate_blk_isetcookie(struct nvdimm_drvdata *ndd,
@ -278,8 +351,8 @@ static inline struct nd_namespace_index *to_next_namespace_index(
unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
#define namespace_label_has(ndd, field) \
(offsetof(struct nd_namespace_label, field) \
#define efi_namespace_label_has(ndd, field) \
(!ndd->cxl && offsetof(struct nvdimm_efi_label, field) \
< sizeof_namespace_label(ndd))
#define nd_dbg_dpa(r, d, res, fmt, arg...) \
@ -359,6 +432,8 @@ static inline bool nsl_validate_nlabel(struct nd_region *nd_region,
struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label)
{
if (ndd->cxl)
return true;
return nsl_get_nlabel(ndd, nd_label) == nd_region->ndr_mappings;
}