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

shiju.jose
2025-02-07T14:45:45Z

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

Signed-off-by: Shiju Jose <shiju.jose@huawei.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