I915_EXEC_BSD_SHIFT
bsd_idx >>= I915_EXEC_BSD_SHIFT;
#define I915_EXEC_BSD_MASK (3 << I915_EXEC_BSD_SHIFT)
#define I915_EXEC_BSD_DEFAULT (0 << I915_EXEC_BSD_SHIFT)
#define I915_EXEC_BSD_RING1 (1 << I915_EXEC_BSD_SHIFT)
#define I915_EXEC_BSD_RING2 (2 << I915_EXEC_BSD_SHIFT)