linux-kernel - [PATCH V2 18/20] cxl/pmem: Add support of cxl lsa 2.1 support in cxl pmem

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Message-Id: <20250730121209.303202-19-s.neeraj@samsung.com>
Date: Wed, 30 Jul 2025 17:42:07 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: 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,
	Neeraj Kumar <s.neeraj@...sung.com>
Subject: [PATCH V2 18/20] cxl/pmem: Add support of cxl lsa 2.1 support in
 cxl pmem

Add support of cxl lsa 2.1 using NDD_CXL_LABEL flag. It also creates cxl
region based on region information parsed from LSA.

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/cxl/core/region.c | 58 +++++++++++++++++++++++++++++++++++++++
 drivers/cxl/cxl.h         |  4 +++
 drivers/cxl/pmem.c        |  2 ++
 3 files changed, 64 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 8578e046aa78..19ccdd136da0 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2665,6 +2665,64 @@ static ssize_t create_ram_region_show(struct device *dev,
 	return __create_region_show(to_cxl_root_decoder(dev), buf);
 }
 
+static int match_free_ep_decoder(struct device *dev, const void *data)
+{
+	struct cxl_decoder *cxld = to_cxl_decoder(dev);
+
+	return !cxld->region;
+}
+
+static struct cxl_decoder *cxl_find_free_ep_decoder(struct cxl_port *port)
+{
+	struct device *dev;
+
+	dev = device_find_child(&port->dev, NULL, match_free_ep_decoder);
+	if (!dev)
+		return NULL;
+
+	/* Release device ref taken via device_find_child() */
+	put_device(dev);
+	return to_cxl_decoder(dev);
+}
+
+void create_pmem_region(struct nvdimm *nvdimm)
+{
+	struct cxl_nvdimm *cxl_nvd;
+	struct cxl_memdev *cxlmd;
+	struct cxl_nvdimm_bridge *cxl_nvb;
+	struct cxl_pmem_region_params *params;
+	struct cxl_root_decoder *cxlrd;
+	struct cxl_decoder *cxld;
+	struct cxl_region *cxlr;
+
+	if (!nvdimm_has_cxl_region(nvdimm))
+		return;
+
+	lockdep_assert_held(&cxl_rwsem.region);
+	cxl_nvd = nvdimm_provider_data(nvdimm);
+	params = nvdimm_get_cxl_region_param(nvdimm);
+	cxlmd = cxl_nvd->cxlmd;
+	cxl_nvb = cxlmd->cxl_nvb;
+	cxlrd = cxlmd->cxlrd;
+
+	/*
+	 * FIXME: Limitation: Region creation support only for
+	 * interleave way == 1
+	 */
+	if (!(params->nlabel == 1))
+		dev_info(&cxlmd->dev,
+			 "Region Creation is not supported with iw > 1\n");
+	else {
+		cxld = cxl_find_free_ep_decoder(cxlmd->endpoint);
+		cxlr = cxl_create_region(cxlrd, CXL_PARTMODE_PMEM,
+					 atomic_read(&cxlrd->region_id),
+					 params, cxld);
+		if (IS_ERR(cxlr))
+			dev_info(&cxlmd->dev, "Region Creation failed\n");
+	}
+}
+EXPORT_SYMBOL_NS_GPL(create_pmem_region, "CXL");
+
 struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     enum cxl_partition_mode mode, int id,
 				     struct cxl_pmem_region_params *params,
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index e249372b642d..51c56069f451 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -870,6 +870,7 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     enum cxl_partition_mode mode, int id,
 				     struct cxl_pmem_region_params *params,
 				     struct cxl_decoder *cxld);
+void create_pmem_region(struct nvdimm *nvdimm);
 #else
 static inline bool is_cxl_pmem_region(struct device *dev)
 {
@@ -903,6 +904,9 @@ cxl_create_region(struct cxl_root_decoder *cxlrd,
 {
 	return NULL;
 }
+static inline void create_pmem_region(struct nvdimm *nvdimm)
+{
+}
 #endif
 
 void cxl_endpoint_parse_cdat(struct cxl_port *port);
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 38a5bcdc68ce..4a7428a5a82c 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -135,6 +135,7 @@ static int cxl_nvdimm_probe(struct device *dev)
 		return rc;
 
 	set_bit(NDD_LABELING, &flags);
+	set_bit(NDD_CXL_LABEL, &flags);
 	set_bit(NDD_REGISTER_SYNC, &flags);
 	set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask);
 	set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask);
@@ -155,6 +156,7 @@ static int cxl_nvdimm_probe(struct device *dev)
 		return -ENOMEM;
 
 	dev_set_drvdata(dev, nvdimm);
+	create_pmem_region(nvdimm);
 	return devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm);
 }
 
-- 
2.34.1