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Message-ID: <cf7d8fd8-e0b8-42cc-bfe4-f20fb0615b4f@intel.com>
Date: Wed, 19 Nov 2025 09:54:42 -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 V4 04/17] nvdimm/label: Include region label in slot
validation
On 11/19/25 12:52 AM, Neeraj Kumar wrote:
> Prior to LSA 2.1 Support, label in slot means only namespace
> label. But with LSA 2.1 a label can be either namespace or
> region label.
>
> Slot validation routine validates label slot by calculating
> label checksum. It was only validating namespace label.
> This changeset also validates region label if present.
>
> In previous patch to_lsa_label() was introduced along with
> to_label(). to_label() returns only namespace label whereas
> to_lsa_label() returns union nd_lsa_label*
>
> In this patch We have converted all usage of to_label()
> to to_lsa_label()
>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
> drivers/nvdimm/label.c | 94 ++++++++++++++++++++++++++++--------------
> drivers/nvdimm/nd.h | 5 +++
> 2 files changed, 69 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 0d587a5b9f7e..6ccc51552822 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -312,16 +312,6 @@ static union nd_lsa_label *to_lsa_label(struct nvdimm_drvdata *ndd, int slot)
> return (union nd_lsa_label *) label;
> }
>
> -static struct nd_namespace_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;
> -}
> -
> #define for_each_clear_bit_le(bit, addr, size) \
> for ((bit) = find_next_zero_bit_le((addr), (size), 0); \
> (bit) < (size); \
> @@ -382,7 +372,7 @@ static bool nsl_validate_checksum(struct nvdimm_drvdata *ndd,
> {
> u64 sum, sum_save;
>
> - if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
> + if (!efi_namespace_label_has(ndd, checksum))
> return true;
>
> sum_save = nsl_get_checksum(ndd, nd_label);
> @@ -397,13 +387,25 @@ static void nsl_calculate_checksum(struct nvdimm_drvdata *ndd,
> {
> u64 sum;
>
> - if (!ndd->cxl && !efi_namespace_label_has(ndd, checksum))
> + if (!efi_namespace_label_has(ndd, checksum))
> return;
> nsl_set_checksum(ndd, nd_label, 0);
> sum = nd_fletcher64(nd_label, sizeof_namespace_label(ndd), 1);
> nsl_set_checksum(ndd, nd_label, sum);
> }
>
> +static bool region_label_validate_checksum(struct nvdimm_drvdata *ndd,
> + struct cxl_region_label *region_label)
> +{
> + u64 sum, sum_save;
> +
> + sum_save = region_label_get_checksum(region_label);
> + region_label_set_checksum(region_label, 0);
> + sum = nd_fletcher64(region_label, sizeof_namespace_label(ndd), 1);
> + region_label_set_checksum(region_label, sum_save);
> + return sum == sum_save;
> +}
> +
> static void region_label_calculate_checksum(struct nvdimm_drvdata *ndd,
> struct cxl_region_label *region_label)
> {
> @@ -415,16 +417,34 @@ static void region_label_calculate_checksum(struct nvdimm_drvdata *ndd,
> }
>
> static bool slot_valid(struct nvdimm_drvdata *ndd,
> - struct nd_namespace_label *nd_label, u32 slot)
> + union nd_lsa_label *lsa_label, u32 slot)
> {
> + struct cxl_region_label *region_label = &lsa_label->region_label;
> + struct nd_namespace_label *nd_label = &lsa_label->ns_label;
> + enum label_type type;
> bool valid;
> + static const char * const label_name[] = {
> + [RG_LABEL_TYPE] = "region",
> + [NS_LABEL_TYPE] = "namespace",
> + };
>
> /* check that we are written where we expect to be written */
> - if (slot != nsl_get_slot(ndd, nd_label))
> - return false;
> - valid = nsl_validate_checksum(ndd, nd_label);
> + if (is_region_label(ndd, lsa_label)) {
> + type = RG_LABEL_TYPE;
> + if (slot != region_label_get_slot(region_label))
> + return false;
> + valid = region_label_validate_checksum(ndd, region_label);
> + } else {
> + type = NS_LABEL_TYPE;
> + if (slot != nsl_get_slot(ndd, nd_label))
> + return false;
> + valid = nsl_validate_checksum(ndd, nd_label);
> + }
> +
> if (!valid)
> - dev_dbg(ndd->dev, "fail checksum. slot: %d\n", slot);
> + dev_dbg(ndd->dev, "%s label checksum fail. slot: %d\n",
> + label_name[type], slot);
> +
> return valid;
> }
>
> @@ -440,14 +460,16 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
> for_each_clear_bit_le(slot, free, nslot) {
> struct nd_namespace_label *nd_label;
> struct nd_region *nd_region = NULL;
> + union nd_lsa_label *lsa_label;
> struct nd_label_id label_id;
> struct resource *res;
> uuid_t label_uuid;
> u32 flags;
>
> - nd_label = to_label(ndd, slot);
> + lsa_label = to_lsa_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);
> @@ -598,18 +620,30 @@ int nd_label_active_count(struct nvdimm_drvdata *ndd)
> return 0;
>
> for_each_clear_bit_le(slot, free, nslot) {
> + struct cxl_region_label *region_label;
> struct nd_namespace_label *nd_label;
> -
> - nd_label = to_label(ndd, slot);
> -
> - if (!slot_valid(ndd, nd_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);
> + union nd_lsa_label *lsa_label;
> + u32 lslot;
> + u64 size, dpa;
> +
> + lsa_label = to_lsa_label(ndd, slot);
> + nd_label = &lsa_label->ns_label;
> + region_label = &lsa_label->region_label;
> +
> + if (!slot_valid(ndd, lsa_label, slot)) {
> + if (is_region_label(ndd, lsa_label)) {
> + lslot = __le32_to_cpu(region_label->slot);
> + size = __le64_to_cpu(region_label->rawsize);
> + dpa = __le64_to_cpu(region_label->dpa);
> + } else {
> + lslot = nsl_get_slot(ndd, nd_label);
> + size = nsl_get_rawsize(ndd, nd_label);
> + dpa = nsl_get_dpa(ndd, nd_label);
> + }
>
> dev_dbg(ndd->dev,
> "slot%d invalid slot: %d dpa: %llx size: %llx\n",
> - slot, label_slot, dpa, size);
> + slot, lslot, dpa, size);
> continue;
> }
> count++;
> @@ -627,10 +661,10 @@ union nd_lsa_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;
> + union nd_lsa_label *lsa_label;
>
> - nd_label = to_label(ndd, slot);
> - if (!slot_valid(ndd, nd_label, slot))
> + lsa_label = to_lsa_label(ndd, slot);
> + if (!slot_valid(ndd, lsa_label, slot))
> continue;
>
> if (n-- == 0)
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index 5fd69c28ffe7..30c7262d8a26 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -346,6 +346,11 @@ region_label_uuid_equal(struct cxl_region_label *region_label,
> return uuid_equal((uuid_t *) region_label->uuid, uuid);
> }
>
> +static inline u32 region_label_get_slot(struct cxl_region_label *region_label)
> +{
> + return __le32_to_cpu(region_label->slot);
> +}
> +
> static inline u64
> region_label_get_checksum(struct cxl_region_label *region_label)
> {
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