drm/i915: add relative ring register macros

Documentation explicitly mentions that the ring registers are
designed to have the same offsets relative to a base registers.

Use this to fight the code beaurocratic in intel_ringbuffer.c.

No code changes in this patch, just the new definitions.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8b8ac60cc839..77c9191f3fd6 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -288,6 +288,14 @@
 #define PRB0_HEAD       0x02034
 #define PRB0_START      0x02038
 #define PRB0_CTL        0x0203c
+#define RENDER_RING_BASE        0x02000
+#define BSD_RING_BASE           0x04000
+#define GEN6_BSD_RING_BASE      0x12000
+#define RING_TAIL(base)         (base)+0x30
+#define RING_HEAD(base)         (base)+0x34
+#define RING_START(base)        (base)+0x38
+#define RING_CTL(base)          (base)+0x3c
+#define RING_HWS_PGA(base)      (base)+0x80
 #define   TAIL_ADDR             0x001FFFF8
 #define   HEAD_WRAP_COUNT       0xFFE00000
 #define   HEAD_WRAP_ONE         0x00200000