From: Shiju Jose <shiju.jose@xxxxxxxxxx>
Add helper function to retrieve a feature entry from the supported
features list, if supported.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Fan Ni <fan.ni@xxxxxxxxxxx>
Signed-off-by: Shiju Jose <shiju.jose@xxxxxxxxxx>
---
drivers/cxl/core/core.h | 2 ++
drivers/cxl/core/features.c | 23 +++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 1803aedb25ca..16bc717376fc 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -123,6 +123,8 @@ int cxl_ras_init(void);
void cxl_ras_exit(void);
#ifdef CONFIG_CXL_FEATURES
+struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_dev_state *cxlds,
+ 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,
diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
index 048ba4fc3538..202c8c21930c 100644
--- a/drivers/cxl/core/features.c
+++ b/drivers/cxl/core/features.c
@@ -203,6 +203,29 @@ int devm_cxl_setup_features(struct cxl_dev_state *cxlds)
}
EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_features, "CXL");
+struct cxl_feat_entry *cxl_get_feature_entry(struct cxl_dev_state *cxlds,
+ const uuid_t *feat_uuid)
+{
+ struct cxl_features_state *cxlfs = to_cxlfs(cxlds);
+ struct cxl_feat_entry *feat_entry;
+ int count;
+
+ if (!cxlfs || !cxlfs->entries || !cxlfs->entries->num_features)
+ return NULL;
+
+ /*
+ * Retrieve the feature entry from the supported features list,
+ * if the feature is supported.
+ */
+ feat_entry = cxlfs->entries->ent;
+ for (count = 0; count < cxlfs->entries->num_features; count++, feat_entry++) {
+ if (uuid_equal(&feat_entry->uuid, feat_uuid))
+ return feat_entry;
+ }
+
+ return NULL;
+}
+
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
