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Message-ID: <20250813154811.00000257@huawei.com>
Date: Wed, 13 Aug 2025 15:48:11 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Neeraj Kumar <s.neeraj@...sung.com>
CC: <linux-cxl@...r.kernel.org>, <nvdimm@...ts.linux.dev>,
<linux-kernel@...r.kernel.org>, <gost.dev@...sung.com>,
<a.manzanares@...sung.com>, <vishak.g@...sung.com>, <neeraj.kernel@...il.com>
Subject: Re: [PATCH V2 05/20] nvdimm/region_label: Add region label updation
routine
On Wed, 30 Jul 2025 17:41:54 +0530
Neeraj Kumar <s.neeraj@...sung.com> wrote:
> Added __pmem_region_label_update region label update routine to update
> region label.
>
> Also used guard(mutex)(&nd_mapping->lock) in place of mutex_lock() and
> mutex_unlock()
>
> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
A few comments inline,
Thanks,
Jonathan
> static bool slot_valid(struct nvdimm_drvdata *ndd,
> struct nd_lsa_label *lsa_label, u32 slot)
> {
> @@ -960,7 +970,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
> return rc;
>
> /* Garbage collect the previous label */
> - mutex_lock(&nd_mapping->lock);
> + guard(mutex)(&nd_mapping->lock);
> list_for_each_entry(label_ent, &nd_mapping->labels, list) {
> if (!label_ent->label)
> continue;
> @@ -972,20 +982,20 @@ static int __pmem_label_update(struct nd_region *nd_region,
> /* 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 = lsa_label;
> - lsa_label = NULL;
> - break;
> - }
> - dev_WARN_ONCE(&nspm->nsio.common.dev, lsa_label,
> - "failed to track label: %d\n",
> - to_slot(ndd, lsa_label));
> - if (lsa_label)
> - rc = -ENXIO;
> - }
> - mutex_unlock(&nd_mapping->lock);
> + if (rc)
> + return rc;
> +
> + list_for_each_entry(label_ent, &nd_mapping->labels, list)
> + if (!label_ent->label) {
> + label_ent->label = lsa_label;
> + lsa_label = NULL;
> + break;
> + }
> + dev_WARN_ONCE(&nspm->nsio.common.dev, lsa_label,
> + "failed to track label: %d\n",
> + to_slot(ndd, lsa_label));
> + if (lsa_label)
> + rc = -ENXIO;
if (lsa_label)
return -ENXIO;
return 0;
is a little clearer.
>
> return rc;
> }
> @@ -1127,6 +1137,137 @@ 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);
export_uuid(rg_label->type, &tmp);
> +
> + /* Set Current Region Label UUID */
> + export_uuid(nd_label->rg_label.uuid, &nd_set->uuid);
export_uuid(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);
As the bot complained... It's le32
> +
> + /* 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 */
> + guard(mutex)(&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)
> + return rc;
> +
> + 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;
return -ENXIO;
> +
return 0;
is clearer.
> + 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);
> +
No blank line here - keep the error check closely associated with the
thing that it is checking.
> + if (rc < 0)
> + return rc;
> +
> + rc = __pmem_region_label_update(nd_region, nd_mapping, i,
> + NSLABEL_FLAG_UPDATING);
> +
Same here.
> + 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);
> +
and here.
> + 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 {
Would be better to have this explicitly as a union
unless later patches add more elements. That way it'll
be obvious at all sites where it is used that it can be one
of several things.
> 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__ */
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