[Intel-gfx] [PATCH 3/3] drm/i915/bdw: Determine BDW GT config attributes

[jeff.mcgee at intel.com]

From: Jeff McGee <jeff.mcgee at intel.com>

Broadwell values could be tabulated by device ID, but we go ahead
and detect from fuses because it is easier and more flexible.

For: VIZ-4636
Signed-off-by: Jeff McGee <jeff.mcgee at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c | 20 +++++++++++++++++++-
 drivers/gpu/drm/i915/i915_reg.h | 11 +++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 0ab8f3a..023d010 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -620,7 +620,25 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
 	}
 
 	/* Initialize required GT attributes info */
-	if (IS_CHERRYVIEW(dev)) {
+	if (IS_BROADWELL(dev)) {
+		u32 fuse2, eu_dis0, eu_dis1, eu_dis2, s_ena, ss_dis;
+
+		fuse2 = I915_READ(GEN8_FUSE2);
+		eu_dis0 = I915_READ(GEN8_EU_DISABLE0);
+		eu_dis1 = I915_READ(GEN8_EU_DISABLE1);
+		eu_dis2 = I915_READ(GEN8_EU_DISABLE2);
+		s_ena = fuse2 & GEN8_F2_S_ENA_MASK;
+		ss_dis = fuse2 & GEN8_F2_SS_DIS_MASK;
+		eu_dis2 &= GEN8_EU_DIS2_S2_SS2_MASK;
+
+		info->slice_total = hweight32(s_ena);
+		info->subslice_total = (3 - hweight32(ss_dis)) *
+				       info->slice_total;
+		info->eu_total = 72 - (hweight32(eu_dis0) +
+				       hweight32(eu_dis1) +
+				       hweight32(eu_dis2));
+		info->threads_per_eu = 7;
+	} else if (IS_CHERRYVIEW(dev)) {
 		u32 reg, ss_dis, eu_dis;
 
 		reg = I915_READ(CHV_FUSE_GT);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f60119c..b08747c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6140,6 +6140,17 @@ enum punit_power_well {
 #define   CHV_FGT_EU_DIS_SS1_R1_SHIFT	28
 #define   CHV_FGT_EU_DIS_SS1_R1_MASK	(0xf << CHV_FGT_EU_DIS_SS1_R1_SHIFT)
 
+#define GEN8_FUSE2			0x9120
+#define   GEN8_F2_SS_DIS_SHIFT		21
+#define   GEN8_F2_SS_DIS_MASK		(0x7 << GEN8_F2_SS_DIS_SHIFT)
+#define   GEN8_F2_S_ENA_SHIFT		25
+#define   GEN8_F2_S_ENA_MASK		(0x7 << GEN8_F2_S_ENA_SHIFT)
+
+#define GEN8_EU_DISABLE0		0x9134
+#define GEN8_EU_DISABLE1		0x9138
+#define GEN8_EU_DISABLE2		0x913c
+#define   GEN8_EU_DIS2_S2_SS2_MASK	(0xff)
+
 /* IVYBRIDGE DPF */
 #define GEN7_L3CDERRST1			0xB008 /* L3CD Error Status 1 */
 #define HSW_L3CDERRST11			0xB208 /* L3CD Error Status register 1 slice 1 */
-- 
2.2.0