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Message-Id: <1690859824.141750165204442.JavaMail.epsvc@epcpadp1new>
Date: Tue, 17 Jun 2025 18:09:29 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: dan.j.williams@...el.com, dave@...olabs.net,
jonathan.cameron@...wei.com, dave.jiang@...el.com,
alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com
Cc: a.manzanares@...sung.com, nifan.cxl@...il.com, anisa.su@...sung.com,
vishak.g@...sung.com, krish.reddy@...sung.com, arun.george@...sung.com,
alok.rathore@...sung.com, s.neeraj@...sung.com, neeraj.kernel@...il.com,
linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
nvdimm@...ts.linux.dev, gost.dev@...sung.com, cpgs@...sung.com
Subject: [RFC PATCH 05/20] nvdimm/region_label: Add region label updation
routine
Added __pmem_region_label_update region label update routine to update
region label
Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
drivers/nvdimm/label.c | 142 ++++++++++++++++++++++++++++++++
drivers/nvdimm/label.h | 2 +
drivers/nvdimm/namespace_devs.c | 12 +++
drivers/nvdimm/nd.h | 20 +++++
include/linux/libnvdimm.h | 8 ++
5 files changed, 184 insertions(+)
diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d5cfaa99f976..7f33d14ce0ef 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -381,6 +381,16 @@ static void nsl_calculate_checksum(struct nvdimm_drvdata *ndd,
nsl_set_checksum(ndd, nd_label, sum);
}
+static void rgl_calculate_checksum(struct nvdimm_drvdata *ndd,
+ struct cxl_region_label *rg_label)
+{
+ u64 sum;
+
+ rgl_set_checksum(rg_label, 0);
+ sum = nd_fletcher64(rg_label, sizeof_namespace_label(ndd), 1);
+ rgl_set_checksum(rg_label, sum);
+}
+
static bool slot_valid(struct nvdimm_drvdata *ndd,
struct nd_lsa_label *nd_label, u32 slot)
{
@@ -1117,6 +1127,138 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
return 0;
}
+static int __pmem_region_label_update(struct nd_region *nd_region,
+ struct nd_mapping *nd_mapping, int pos, unsigned long flags)
+{
+ struct nd_interleave_set *nd_set = nd_region->nd_set;
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+ struct nd_lsa_label *nd_label;
+ struct cxl_region_label *rg_label;
+ struct nd_namespace_index *nsindex;
+ struct nd_label_ent *label_ent;
+ unsigned long *free;
+ u32 nslot, slot;
+ size_t offset;
+ int rc;
+ uuid_t tmp;
+
+ if (!preamble_next(ndd, &nsindex, &free, &nslot))
+ return -ENXIO;
+
+ /* allocate and write the label to the staging (next) index */
+ slot = nd_label_alloc_slot(ndd);
+ if (slot == UINT_MAX)
+ return -ENXIO;
+ dev_dbg(ndd->dev, "allocated: %d\n", slot);
+
+ nd_label = to_label(ndd, slot);
+
+ memset(nd_label, 0, sizeof_namespace_label(ndd));
+ rg_label = &nd_label->rg_label;
+
+ /* Set Region Label Format identification UUID */
+ uuid_parse(CXL_REGION_UUID, &tmp);
+ export_uuid(nd_label->rg_label.type, &tmp);
+
+ /* Set Current Region Label UUID */
+ export_uuid(nd_label->rg_label.uuid, &nd_set->uuid);
+
+ rg_label->flags = __cpu_to_le32(flags);
+ rg_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
+ rg_label->position = __cpu_to_le16(pos);
+ rg_label->dpa = __cpu_to_le64(nd_mapping->start);
+ rg_label->rawsize = __cpu_to_le64(nd_mapping->size);
+ rg_label->hpa = __cpu_to_le64(nd_set->res->start);
+ rg_label->slot = __cpu_to_le32(slot);
+ rg_label->ig = __cpu_to_le32(nd_set->interleave_granularity);
+ rg_label->align = __cpu_to_le16(0);
+
+ /* Update fletcher64 Checksum */
+ rgl_calculate_checksum(ndd, rg_label);
+
+ /* update label */
+ offset = nd_label_offset(ndd, nd_label);
+ rc = nvdimm_set_config_data(ndd, offset, nd_label,
+ sizeof_namespace_label(ndd));
+ if (rc < 0) {
+ nd_label_free_slot(ndd, slot);
+ return rc;
+ }
+
+ /* Garbage collect the previous label */
+ mutex_lock(&nd_mapping->lock);
+ list_for_each_entry(label_ent, &nd_mapping->labels, list) {
+ if (!label_ent->label)
+ continue;
+ if (rgl_uuid_equal(&label_ent->label->rg_label, &nd_set->uuid))
+ reap_victim(nd_mapping, label_ent);
+ }
+
+ /* update index */
+ rc = nd_label_write_index(ndd, ndd->ns_next,
+ nd_inc_seq(__le32_to_cpu(nsindex->seq)), 0);
+
+ if (rc == 0) {
+ list_for_each_entry(label_ent, &nd_mapping->labels, list)
+ if (!label_ent->label) {
+ label_ent->label = nd_label;
+ nd_label = NULL;
+ break;
+ }
+ dev_WARN_ONCE(&nd_region->dev, nd_label,
+ "failed to track label: %d\n",
+ to_slot(ndd, nd_label));
+ if (nd_label)
+ rc = -ENXIO;
+ }
+ mutex_unlock(&nd_mapping->lock);
+
+ return rc;
+}
+
+int nd_pmem_region_label_update(struct nd_region *nd_region)
+{
+ int i, rc;
+
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+ /* No need to update region label for non cxl format */
+ if (!ndd->cxl)
+ continue;
+
+ /* Init labels to include region label */
+ rc = init_labels(nd_mapping, 1);
+
+ if (rc < 0)
+ return rc;
+
+ rc = __pmem_region_label_update(nd_region, nd_mapping, i,
+ NSLABEL_FLAG_UPDATING);
+
+ if (rc)
+ return rc;
+ }
+
+ /* Clear the UPDATING flag per UEFI 2.7 expectations */
+ for (i = 0; i < nd_region->ndr_mappings; i++) {
+ struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+ struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
+
+ /* No need to update region label for non cxl format */
+ if (!ndd->cxl)
+ continue;
+
+ rc = __pmem_region_label_update(nd_region, nd_mapping, i, 0);
+
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
int __init nd_label_init(void)
{
WARN_ON(guid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_guid));
diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 4883b3a1320f..0f428695017d 100644
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -190,6 +190,7 @@ struct nd_namespace_label {
struct nd_lsa_label {
union {
struct nd_namespace_label ns_label;
+ struct cxl_region_label rg_label;
};
};
@@ -233,4 +234,5 @@ struct nd_region;
struct nd_namespace_pmem;
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size);
+int nd_pmem_region_label_update(struct nd_region *nd_region);
#endif /* __LABEL_H__ */
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 23b9def71012..6cccb4d2fc7b 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -232,6 +232,18 @@ static ssize_t __alt_name_store(struct device *dev, const char *buf,
return rc;
}
+int nd_region_label_update(struct nd_region *nd_region)
+{
+ int rc;
+
+ nvdimm_bus_lock(&nd_region->dev);
+ rc = nd_pmem_region_label_update(nd_region);
+ nvdimm_bus_unlock(&nd_region->dev);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(nd_region_label_update);
+
static int nd_namespace_label_update(struct nd_region *nd_region,
struct device *dev)
{
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 07d665f18bf6..2fdc92b29e8a 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -322,6 +322,26 @@ static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd,
export_uuid(ns_label->cxl.region_uuid, uuid);
}
+static inline bool rgl_uuid_equal(struct cxl_region_label *rg_label,
+ const uuid_t *uuid)
+{
+ uuid_t tmp;
+
+ import_uuid(&tmp, rg_label->uuid);
+ return uuid_equal(&tmp, uuid);
+}
+
+static inline u64 rgl_get_checksum(struct cxl_region_label *rg_label)
+{
+ return __le64_to_cpu(rg_label->checksum);
+}
+
+static inline void rgl_set_checksum(struct cxl_region_label *rg_label,
+ u64 checksum)
+{
+ rg_label->checksum = __cpu_to_le64(checksum);
+}
+
bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd,
struct nd_namespace_label *nd_label, guid_t *guid);
enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd,
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 0a55900842c8..b06bd45373f4 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -115,6 +115,13 @@ struct nd_interleave_set {
u64 altcookie;
guid_t type_guid;
+
+ /* v2.1 region label info */
+ uuid_t uuid;
+ int interleave_ways;
+ int interleave_granularity;
+ struct resource *res;
+ int nr_targets;
};
struct nd_mapping_desc {
@@ -302,6 +309,7 @@ int nvdimm_has_flush(struct nd_region *nd_region);
int nvdimm_has_cache(struct nd_region *nd_region);
int nvdimm_in_overwrite(struct nvdimm *nvdimm);
bool is_nvdimm_sync(struct nd_region *nd_region);
+int nd_region_label_update(struct nd_region *nd_region);
static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc)
--
2.34.1
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