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Message-ID: <cf66eadc-baf2-4962-a9c4-2a6205b5233b@intel.com>
Date: Fri, 15 Aug 2025 15:02:26 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Neeraj Kumar <s.neeraj@...sung.com>, linux-cxl@...r.kernel.org,
nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org, gost.dev@...sung.com
Cc: a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com
Subject: Re: [PATCH V2 02/20] nvdimm/label: Prep patch to accommodate cxl lsa
2.1 support
On 7/30/25 5:11 AM, Neeraj Kumar wrote:
> LSA 2.1 format introduces region label, which can also reside
> into LSA along with only namespace label as per v1.1 and v1.2
>
> As both namespace and region labels are of same size of 256 bytes.
> Thus renamed "struct nd_namespace_label" to "struct nd_lsa_label",
> where both namespace label and region label can stay as union.
>
> No functional change introduced.
>
> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
> ---
> drivers/nvdimm/label.c | 58 +++++++++++++++++++--------------
> drivers/nvdimm/label.h | 12 ++++++-
> drivers/nvdimm/namespace_devs.c | 33 +++++++++++++------
> drivers/nvdimm/nd.h | 2 +-
> 4 files changed, 68 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 7a011ee02d79..75bc11da4c11 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -271,7 +271,7 @@ static void nd_label_copy(struct nvdimm_drvdata *ndd,
> memcpy(dst, src, sizeof_namespace_index(ndd));
> }
>
> -static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
> +static struct nd_lsa_label *nd_label_base(struct nvdimm_drvdata *ndd)
> {
> void *base = to_namespace_index(ndd, 0);
>
> @@ -279,7 +279,7 @@ static struct nd_namespace_label *nd_label_base(struct nvdimm_drvdata *ndd)
> }
>
> static int to_slot(struct nvdimm_drvdata *ndd,
> - struct nd_namespace_label *nd_label)
> + struct nd_lsa_label *nd_label)
> {
> unsigned long label, base;
>
> @@ -289,14 +289,14 @@ static int to_slot(struct nvdimm_drvdata *ndd,
> return (label - base) / sizeof_namespace_label(ndd);
> }
>
> -static struct nd_namespace_label *to_label(struct nvdimm_drvdata *ndd, int slot)
> +static struct nd_lsa_label *to_label(struct nvdimm_drvdata *ndd, int slot)
> {
> unsigned long label, base;
>
> base = (unsigned long) nd_label_base(ndd);
> label = base + sizeof_namespace_label(ndd) * slot;
>
> - return (struct nd_namespace_label *) label;
> + return (struct nd_lsa_label *) label;
> }
>
> #define for_each_clear_bit_le(bit, addr, size) \
> @@ -382,9 +382,10 @@ static void nsl_calculate_checksum(struct nvdimm_drvdata *ndd,
> }
>
> static bool slot_valid(struct nvdimm_drvdata *ndd,
> - struct nd_namespace_label *nd_label, u32 slot)
> + struct nd_lsa_label *lsa_label, u32 slot)
> {
> bool valid;
> + struct nd_namespace_label *nd_label = &lsa_label->ns_label;
>
> /* check that we are written where we expect to be written */
> if (slot != nsl_get_slot(ndd, nd_label))
> @@ -405,6 +406,7 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
> return 0; /* no label, nothing to reserve */
>
> for_each_clear_bit_le(slot, free, nslot) {
> + struct nd_lsa_label *lsa_label;
> struct nd_namespace_label *nd_label;
> struct nd_region *nd_region = NULL;
> struct nd_label_id label_id;
> @@ -412,9 +414,10 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
> uuid_t label_uuid;
> u32 flags;
>
> - nd_label = to_label(ndd, slot);
> + lsa_label = to_label(ndd, slot);
> + nd_label = &lsa_label->ns_label;
>
> - if (!slot_valid(ndd, nd_label, slot))
> + if (!slot_valid(ndd, lsa_label, slot))
> continue;
>
> nsl_get_uuid(ndd, nd_label, &label_uuid);
> @@ -565,11 +568,13 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
> return 0;
>
> for_each_clear_bit_le(slot, free, nslot) {
> + struct nd_lsa_label *lsa_label;
> struct nd_namespace_label *nd_label;
>
> - nd_label = to_label(ndd, slot);
> + lsa_label = to_label(ndd, slot);
> + nd_label = &lsa_label->ns_label;
>
> - if (!slot_valid(ndd, nd_label, slot)) {
> + if (!slot_valid(ndd, lsa_label, slot)) {
> u32 label_slot = nsl_get_slot(ndd, nd_label);
> u64 size = nsl_get_rawsize(ndd, nd_label);
> u64 dpa = nsl_get_dpa(ndd, nd_label);
> @@ -584,7 +589,7 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
> return count;
> }
>
> -struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
> +struct nd_lsa_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
> {
> struct nd_namespace_index *nsindex;
> unsigned long *free;
> @@ -594,10 +599,10 @@ struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n)
> return NULL;
>
> for_each_clear_bit_le(slot, free, nslot) {
> - struct nd_namespace_label *nd_label;
> + struct nd_lsa_label *lsa_label;
>
> - nd_label = to_label(ndd, slot);
> - if (!slot_valid(ndd, nd_label, slot))
> + lsa_label = to_label(ndd, slot);
> + if (!slot_valid(ndd, lsa_label, slot))
> continue;
>
> if (n-- == 0)
> @@ -738,7 +743,7 @@ static int nd_label_write_index(struct nvdimm_drvdata *ndd, int index, u32 seq,
> }
>
> static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
> - struct nd_namespace_label *nd_label)
> + struct nd_lsa_label *nd_label)
> {
> return (unsigned long) nd_label
> - (unsigned long) to_namespace_index(ndd, 0);
> @@ -892,6 +897,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
> struct nd_namespace_common *ndns = &nspm->nsio.common;
> struct nd_interleave_set *nd_set = nd_region->nd_set;
> struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
> + struct nd_lsa_label *lsa_label;
> struct nd_namespace_label *nd_label;
> struct nd_namespace_index *nsindex;
> struct nd_label_ent *label_ent;
> @@ -923,8 +929,10 @@ static int __pmem_label_update(struct nd_region *nd_region,
> return -ENXIO;
> dev_dbg(ndd->dev, "allocated: %d\n", slot);
>
> - nd_label = to_label(ndd, slot);
> - memset(nd_label, 0, sizeof_namespace_label(ndd));
> + lsa_label = to_label(ndd, slot);
> + memset(lsa_label, 0, sizeof_namespace_label(ndd));
> +
> + nd_label = &lsa_label->ns_label;
> nsl_set_uuid(ndd, nd_label, nspm->uuid);
> nsl_set_name(ndd, nd_label, nspm->alt_name);
> nsl_set_flags(ndd, nd_label, flags);
> @@ -942,7 +950,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
> nd_dbg_dpa(nd_region, ndd, res, "\n");
>
> /* update label */
> - offset = nd_label_offset(ndd, nd_label);
> + offset = nd_label_offset(ndd, lsa_label);
> rc = nvdimm_set_config_data(ndd, offset, nd_label,
> sizeof_namespace_label(ndd));
> if (rc < 0)
> @@ -954,7 +962,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
> if (!label_ent->label)
> continue;
> if (test_and_clear_bit(ND_LABEL_REAP, &label_ent->flags) ||
> - nsl_uuid_equal(ndd, label_ent->label, nspm->uuid))
> + nsl_uuid_equal(ndd, &label_ent->label->ns_label, nspm->uuid))
> reap_victim(nd_mapping, label_ent);
> }
>
> @@ -964,14 +972,14 @@ static int __pmem_label_update(struct nd_region *nd_region,
> 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;
> + label_ent->label = lsa_label;
> + lsa_label = NULL;
> break;
> }
> - dev_WARN_ONCE(&nspm->nsio.common.dev, nd_label,
> + dev_WARN_ONCE(&nspm->nsio.common.dev, lsa_label,
> "failed to track label: %d\n",
> - to_slot(ndd, nd_label));
> - if (nd_label)
> + to_slot(ndd, lsa_label));
> + if (lsa_label)
> rc = -ENXIO;
> }
> mutex_unlock(&nd_mapping->lock);
> @@ -1042,12 +1050,12 @@ static int del_labels(struct nd_mapping *nd_mapping, uuid_t *uuid)
>
> mutex_lock(&nd_mapping->lock);
> list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
> - struct nd_namespace_label *nd_label = label_ent->label;
> + struct nd_lsa_label *nd_label = label_ent->label;
>
> if (!nd_label)
> continue;
> active++;
> - if (!nsl_uuid_equal(ndd, nd_label, uuid))
> + if (!nsl_uuid_equal(ndd, &nd_label->ns_label, uuid))
> continue;
> active--;
> slot = to_slot(ndd, nd_label);
> diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
> index 0650fb4b9821..4883b3a1320f 100644
> --- a/drivers/nvdimm/label.h
> +++ b/drivers/nvdimm/label.h
> @@ -183,6 +183,16 @@ struct nd_namespace_label {
> };
> };
>
> +/*
> + * LSA 2.1 format introduces region label, which can also reside
> + * into LSA along with only namespace label as per v1.1 and v1.2
> + */
> +struct nd_lsa_label {
> + union {
> + struct nd_namespace_label ns_label;
> + };
> +};
I think originally 'struct nd_namespace_label' wrapped a union to avoid changing code that already has 'struct nd_namespace_label' in the function. But since you are creating a whole new thing, maybe just create a union directly since you end up touching all the function parameters in this patch anyways.
union nd_lsa_label {
struct nd_namespace_label ns_label;
struct cxl_region_label region_label;
};
DJ
> +
> #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"
> @@ -215,7 +225,7 @@ struct nvdimm_drvdata;
> int nd_label_data_init(struct nvdimm_drvdata *ndd);
> size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
> int nd_label_active_count(struct nvdimm_drvdata *ndd);
> -struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
> +struct nd_lsa_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
> u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
> bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
> u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 55cfbf1e0a95..bdf1ed6f23d8 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -1009,10 +1009,11 @@ static int namespace_update_uuid(struct nd_region *nd_region,
>
> mutex_lock(&nd_mapping->lock);
> list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> - struct nd_namespace_label *nd_label = label_ent->label;
> + struct nd_namespace_label *nd_label;
> struct nd_label_id label_id;
> uuid_t uuid;
>
> + nd_label = &label_ent->label->ns_label;
> if (!nd_label)
> continue;
> nsl_get_uuid(ndd, nd_label, &uuid);
> @@ -1573,11 +1574,14 @@ static bool has_uuid_at_pos(struct nd_region *nd_region, const uuid_t *uuid,
> bool found_uuid = false;
>
> list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> - struct nd_namespace_label *nd_label = label_ent->label;
> + struct nd_lsa_label *lsa_label = label_ent->label;
> + struct nd_namespace_label *nd_label;
> u16 position;
>
> - if (!nd_label)
> + if (!lsa_label)
> continue;
> +
> + nd_label = &lsa_label->ns_label;
> position = nsl_get_position(ndd, nd_label);
>
> if (!nsl_validate_isetcookie(ndd, nd_label, cookie))
> @@ -1615,17 +1619,21 @@ static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id)
> 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);
> + struct nd_lsa_label *lsa_label = NULL;
> struct nd_namespace_label *nd_label = NULL;
> u64 hw_start, hw_end, pmem_start, pmem_end;
> struct nd_label_ent *label_ent;
>
> lockdep_assert_held(&nd_mapping->lock);
> list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> - nd_label = label_ent->label;
> - if (!nd_label)
> + lsa_label = label_ent->label;
> + if (!lsa_label)
> continue;
> +
> + nd_label = &lsa_label->ns_label;
> if (nsl_uuid_equal(ndd, nd_label, pmem_id))
> break;
> + lsa_label = NULL;
> nd_label = NULL;
> }
>
> @@ -1746,19 +1754,21 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
>
> /* Calculate total size and populate namespace properties from label0 */
> for (i = 0; i < nd_region->ndr_mappings; i++) {
> + struct nd_lsa_label *lsa_label;
> struct nd_namespace_label *label0;
> struct nvdimm_drvdata *ndd;
>
> nd_mapping = &nd_region->mapping[i];
> label_ent = list_first_entry_or_null(&nd_mapping->labels,
> typeof(*label_ent), list);
> - label0 = label_ent ? label_ent->label : NULL;
> + lsa_label = label_ent ? label_ent->label : NULL;
>
> - if (!label0) {
> + if (!lsa_label) {
> WARN_ON(1);
> continue;
> }
>
> + label0 = &lsa_label->ns_label;
> ndd = to_ndd(nd_mapping);
> size += nsl_get_rawsize(ndd, label0);
> if (nsl_get_position(ndd, label0) != 0)
> @@ -1943,12 +1953,15 @@ static struct device **scan_labels(struct nd_region *nd_region)
>
> /* "safe" because create_namespace_pmem() might list_move() label_ent */
> list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
> - struct nd_namespace_label *nd_label = label_ent->label;
> + struct nd_lsa_label *lsa_label = label_ent->label;
> + struct nd_namespace_label *nd_label;
> struct device **__devs;
>
> - if (!nd_label)
> + if (!lsa_label)
> continue;
>
> + nd_label = &lsa_label->ns_label;
> +
> /* skip labels that describe extents outside of the region */
> if (nsl_get_dpa(ndd, nd_label) < nd_mapping->start ||
> nsl_get_dpa(ndd, nd_label) > map_end)
> @@ -2122,7 +2135,7 @@ static int init_active_labels(struct nd_region *nd_region)
> if (!count)
> continue;
> for (j = 0; j < count; j++) {
> - struct nd_namespace_label *label;
> + struct nd_lsa_label *label;
>
> label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
> if (!label_ent)
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index 1cc06cc58d14..61348dee687d 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -376,7 +376,7 @@ enum nd_label_flags {
> struct nd_label_ent {
> struct list_head list;
> unsigned long flags;
> - struct nd_namespace_label *label;
> + struct nd_lsa_label *label;
> };
>
> enum nd_mapping_lock_class {
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