drm/i915/bdw: Display execlists info in debugfs

v2: Warn and return if LRCs are not enabled.

v3: Grab the Execlists spinlock (noticed by Daniel Vetter).

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>

v4: Lock the struct mutex for atomic state capture

Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
[danvet: Checkpatch.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_lrc.c

@@ -46,12 +46,6 @@
 
 #define GEN8_LR_CONTEXT_ALIGN 4096
 
-#define RING_ELSP(ring)			((ring)->mmio_base+0x230)
-#define RING_EXECLIST_STATUS(ring)	((ring)->mmio_base+0x234)
-#define RING_CONTEXT_CONTROL(ring)	((ring)->mmio_base+0x244)
-#define RING_CONTEXT_STATUS_BUF(ring)	((ring)->mmio_base+0x370)
-#define RING_CONTEXT_STATUS_PTR(ring)	((ring)->mmio_base+0x3a0)
-
 #define RING_EXECLIST_QFULL		(1 << 0x2)
 #define RING_EXECLIST1_VALID		(1 << 0x3)
 #define RING_EXECLIST0_VALID		(1 << 0x4)