CTB_DESC_SIZE
blob_size = 2 * CTB_DESC_SIZE + CTB_H2G_BUFFER_SIZE + CTB_G2H_BUFFER_SIZE;
cmds = blob + 2 * CTB_DESC_SIZE;
desc = blob + CTB_DESC_SIZE;
cmds = blob + 2 * CTB_DESC_SIZE + CTB_H2G_BUFFER_SIZE;
#define CTB_H2G_BUFFER_OFFSET (CTB_DESC_SIZE * 2)
g2h->desc = IOSYS_MAP_INIT_OFFSET(map, CTB_DESC_SIZE);
desc_addr = xe_bo_ggtt_addr(ct->bo) + CTB_DESC_SIZE;