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>

3 files changed, 12 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
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f0b44d3ba958..c1517b2d2f08 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -801,6 +801,7 @@ static const struct intel_ring_buffer render_ring = {
                 .tail = PRB0_TAIL,
                 .start = PRB0_START
         },
+        .mmio_base              = RENDER_RING_BASE,
         .size                   = 32 * PAGE_SIZE,
         .alignment              = PAGE_SIZE,
         .virtual_start          = NULL,
@@ -839,6 +840,7 @@ static const struct intel_ring_buffer bsd_ring = {
                 .tail = BSD_RING_TAIL,
                 .start = BSD_RING_START
         },
+        .mmio_base              = BSD_RING_BASE,
         .size                   = 32 * PAGE_SIZE,
         .alignment              = PAGE_SIZE,
         .virtual_start          = NULL,
@@ -957,6 +959,7 @@ static const struct intel_ring_buffer gen6_bsd_ring = {
                .tail   = GEN6_BSD_RING_TAIL,
                .start  = GEN6_BSD_RING_START
        },
+       .mmio_base               = GEN6_BSD_RING_BASE,
        .size                    = 32 * PAGE_SIZE,
        .alignment               = PAGE_SIZE,
        .virtual_start           = NULL,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index be1fd9b37088..3917d8b1c1a9 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -20,6 +20,7 @@ struct  intel_ring_buffer {
                         u32 tail;
                         u32 start;
         } regs;
+        u32             mmio_base;
         unsigned long   size;
         unsigned int    alignment;
         void            *virtual_start;