Merge tag 'v6.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into gpio/for-next

Linux 6.18-rc3

1 files changed, 19 insertions, 2 deletions

diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index cd7ee4df9045..81e603839c4a 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -338,6 +338,7 @@ struct ffa_mem_region_attributes {
 	 * an `struct ffa_mem_region_addr_range`.
 	 */
 	u32 composite_off;
+	u8 impdef_val[16];
 	u64 reserved;
 };
 
@@ -417,15 +418,31 @@ struct ffa_mem_region {
 #define CONSTITUENTS_OFFSET(x)	\
 	(offsetof(struct ffa_composite_mem_region, constituents[x]))
 
+#define FFA_EMAD_HAS_IMPDEF_FIELD(version)	((version) >= FFA_VERSION_1_2)
+#define FFA_MEM_REGION_HAS_EP_MEM_OFFSET(version) ((version) > FFA_VERSION_1_0)
+
+static inline u32 ffa_emad_size_get(u32 ffa_version)
+{
+	u32 sz;
+	struct ffa_mem_region_attributes *ep_mem_access;
+
+	if (FFA_EMAD_HAS_IMPDEF_FIELD(ffa_version))
+		sz = sizeof(*ep_mem_access);
+	else
+		sz = sizeof(*ep_mem_access) - sizeof(ep_mem_access->impdef_val);
+
+	return sz;
+}
+
 static inline u32
 ffa_mem_desc_offset(struct ffa_mem_region *buf, int count, u32 ffa_version)
 {
-	u32 offset = count * sizeof(struct ffa_mem_region_attributes);
+	u32 offset = count * ffa_emad_size_get(ffa_version);
 	/*
 	 * Earlier to v1.1, the endpoint memory descriptor array started at
 	 * offset 32(i.e. offset of ep_mem_offset in the current structure)
 	 */
-	if (ffa_version <= FFA_VERSION_1_0)
+	if (!FFA_MEM_REGION_HAS_EP_MEM_OFFSET(ffa_version))
 		offset += offsetof(struct ffa_mem_region, ep_mem_offset);
 	else
 		offset += sizeof(struct ffa_mem_region);