drm/i915: Unify GT* and GT3 definitions

This patch clean up a bit the platform definition block in
a way to avoid duplications and to let clear that GT3 for
the current platform only have the extra Media engine (BSD2).

v2: Kabylake IS_KABYLAKE as Anusha noticed.

v3: Avoid EXTRA_ENGINE_MASK and list rings out on GT3 to
    make it more clear.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1496765166-7068-1-git-send-email-rodrigo.vivi@intel.com

drivers/gpu/drm/i915/i915_pci.c

@@ -312,16 +312,17 @@ static const struct intel_device_info intel_haswell_info = {
 	.has_full_48bit_ppgtt = 1, \
 	.has_64bit_reloc = 1
 
+#define BDW_PLATFORM \
+	BDW_FEATURES, \
+	.gen = 8, \
+	.platform = INTEL_BROADWELL
+
 static const struct intel_device_info intel_broadwell_info = {
-	BDW_FEATURES,
-	.gen = 8,
-	.platform = INTEL_BROADWELL,
+	BDW_PLATFORM,
 };
 
 static const struct intel_device_info intel_broadwell_gt3_info = {
-	BDW_FEATURES,
-	.gen = 8,
-	.platform = INTEL_BROADWELL,
+	BDW_PLATFORM,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
 };
 
@@ -347,22 +348,20 @@ static const struct intel_device_info intel_cherryview_info = {
 	CHV_COLORS,
 };
 
+#define SKL_PLATFORM \
+	BDW_FEATURES, \
+	.gen = 9, \
+	.platform = INTEL_SKYLAKE, \
+	.has_csr = 1, \
+	.has_guc = 1, \
+	.ddb_size = 896
+
 static const struct intel_device_info intel_skylake_info = {
-	BDW_FEATURES,
-	.platform = INTEL_SKYLAKE,
-	.gen = 9,
-	.has_csr = 1,
-	.has_guc = 1,
-	.ddb_size = 896,
+	SKL_PLATFORM,
 };
 
 static const struct intel_device_info intel_skylake_gt3_info = {
-	BDW_FEATURES,
-	.platform = INTEL_SKYLAKE,
-	.gen = 9,
-	.has_csr = 1,
-	.has_guc = 1,
-	.ddb_size = 896,
+	SKL_PLATFORM,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
 };
 
@@ -406,22 +405,20 @@ static const struct intel_device_info intel_geminilake_info = {
 	.color = { .degamma_lut_size = 0, .gamma_lut_size = 1024 }
 };
 
+#define KBL_PLATFORM \
+	BDW_FEATURES, \
+	.gen = 9, \
+	.platform = INTEL_KABYLAKE, \
+	.has_csr = 1, \
+	.has_guc = 1, \
+	.ddb_size = 896
+
 static const struct intel_device_info intel_kabylake_info = {
-	BDW_FEATURES,
-	.platform = INTEL_KABYLAKE,
-	.gen = 9,
-	.has_csr = 1,
-	.has_guc = 1,
-	.ddb_size = 896,
+	KBL_PLATFORM,
 };
 
 static const struct intel_device_info intel_kabylake_gt3_info = {
-	BDW_FEATURES,
-	.platform = INTEL_KABYLAKE,
-	.gen = 9,
-	.has_csr = 1,
-	.has_guc = 1,
-	.ddb_size = 896,
+	KBL_PLATFORM,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
 };