linux-kernel - [PATCH v19 07/15] cxl: Add helper function to retrieve a feature entry

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Message-ID: <20250207144445.1879-8-shiju.jose@huawei.com>
Date: Fri, 7 Feb 2025 14:44:36 +0000
From: <shiju.jose@...wei.com>
To: <linux-edac@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
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Subject: [PATCH v19 07/15] cxl: Add helper function to retrieve a feature entry

From: Shiju Jose <shiju.jose@...wei.com>

Add helper function to retrieve a feature entry from the supported
features list, if supported.

Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
---
 drivers/cxl/core/features.c | 21 +++++++++++++++++++++
 include/cxl/features.h      |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
index 5f64185a5c7a..bf175e69cda1 100644
--- a/drivers/cxl/core/features.c
+++ b/drivers/cxl/core/features.c
@@ -43,6 +43,27 @@ bool is_cxl_feature_exclusive(struct cxl_feat_entry *entry)
 }
 EXPORT_SYMBOL_NS_GPL(is_cxl_feature_exclusive, "CXL");
 
+struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_memdev *cxlmd,
+					     const uuid_t *feat_uuid)
+{
+	struct cxl_features_state *cxlfs = cxlmd->cxlfs;
+	struct cxl_feat_entry *feat_entry;
+	int count;
+
+	/*
+	 * Retrieve the feature entry from the supported features list,
+	 * if the feature is supported.
+	 */
+	feat_entry = cxlfs->entries;
+	for (count = 0; count < cxlfs->num_features; count++, feat_entry++) {
+		if (uuid_equal(&feat_entry->uuid, feat_uuid))
+			return feat_entry;
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_get_feature_entry, "CXL");
+
 size_t cxl_get_feature(struct cxl_mailbox *cxl_mbox, const uuid_t *feat_uuid,
 		       enum cxl_get_feat_selection selection,
 		       void *feat_out, size_t feat_out_size, u16 offset,
diff --git a/include/cxl/features.h b/include/cxl/features.h
index e52d0573f504..563d966beee5 100644
--- a/include/cxl/features.h
+++ b/include/cxl/features.h
@@ -68,6 +68,8 @@ struct cxl_features_state {
 };
 
 struct cxl_mailbox;
+struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_memdev *cxlmd,
+					     const uuid_t *feat_uuid);
 size_t cxl_get_feature(struct cxl_mailbox *cxl_mbox, const uuid_t *feat_uuid,
 		       enum cxl_get_feat_selection selection,
 		       void *feat_out, size_t feat_out_size, u16 offset,
-- 
2.43.0