[PATCH 1/4] drm/i915: Split SSEU init into functions by platform

jeff.mcgee
2015-04-04T01:12:49Z

drivers/gpu/drm/i915/i915_dma.c | 234 +++++++++++++++++++++-------------------
1 file changed, 125 insertions(+), 109 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index ec661fe..9691f0f 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -564,6 +564,127 @@ static void i915_dump_device_info(struct drm_i915_private *dev_priv)
#undef SEP_COMMA
}

+static void cherryview_sseu_info_init(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_device_info *info;
+ u32 fuse, eu_dis;
+
+ info = (struct intel_device_info *)&dev_priv->info;
+ fuse = I915_READ(CHV_FUSE_GT);
+
+ info->slice_total = 1;
+
+ if (!(fuse & CHV_FGT_DISABLE_SS0)) {
+ info->subslice_per_slice++;
+ eu_dis = fuse & (CHV_FGT_EU_DIS_SS0_R0_MASK |
+ CHV_FGT_EU_DIS_SS0_R1_MASK);
+ info->eu_total += 8 - hweight32(eu_dis);
+ }
+
+ if (!(fuse & CHV_FGT_DISABLE_SS1)) {
+ info->subslice_per_slice++;
+ eu_dis = fuse & (CHV_FGT_EU_DIS_SS1_R0_MASK |
+ CHV_FGT_EU_DIS_SS1_R1_MASK);
+ info->eu_total += 8 - hweight32(eu_dis);
+ }
+
+ info->subslice_total = info->subslice_per_slice;
+ /*
+ * CHV expected to always have a uniform distribution of EU
+ * across subslices.
+ */
+ info->eu_per_subslice = info->subslice_total ?
+ info->eu_total / info->subslice_total :
+ 0;
+ /*
+ * CHV supports subslice power gating on devices with more than
+ * one subslice, and supports EU power gating on devices with
+ * more than one EU pair per subslice.
+ */
+ info->has_slice_pg = 0;
+ info->has_subslice_pg = (info->subslice_total > 1);
+ info->has_eu_pg = (info->eu_per_subslice > 2);
+}
+
+static void gen9_sseu_info_init(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_device_info *info;
+ const int s_max = 3, ss_max = 4, eu_max = 8;
+ int s, ss;
+ u32 fuse2, eu_disable[s_max], s_enable, ss_disable;
+
+ info = (struct intel_device_info *)&dev_priv->info;
+ fuse2 = I915_READ(GEN8_FUSE2);
+ s_enable = (fuse2 & GEN8_F2_S_ENA_MASK) >>
+ GEN8_F2_S_ENA_SHIFT;
+ ss_disable = (fuse2 & GEN9_F2_SS_DIS_MASK) >>
+ GEN9_F2_SS_DIS_SHIFT;
+
+ eu_disable[0] = I915_READ(GEN8_EU_DISABLE0);
+ eu_disable[1] = I915_READ(GEN8_EU_DISABLE1);
+ eu_disable[2] = I915_READ(GEN8_EU_DISABLE2);
+
+ info->slice_total = hweight32(s_enable);
+ /*
+ * The subslice disable field is global, i.e. it applies
+ * to each of the enabled slices.
+ */
+ info->subslice_per_slice = ss_max - hweight32(ss_disable);
+ info->subslice_total = info->slice_total *
+ info->subslice_per_slice;
+
+ /*
+ * Iterate through enabled slices and subslices to
+ * count the total enabled EU.
+ */
+ for (s = 0; s < s_max; s++) {
+ if (!(s_enable & (0x1 << s)))
+ /* skip disabled slice */
+ continue;
+
+ for (ss = 0; ss < ss_max; ss++) {
+ u32 n_disabled;
+
+ if (ss_disable & (0x1 << ss))
+ /* skip disabled subslice */
+ continue;
+
+ n_disabled = hweight8(eu_disable[s] >>
+ (ss * eu_max));
+
+ /*
+ * Record which subslice(s) has(have) 7 EUs. we
+ * can tune the hash used to spread work among
+ * subslices if they are unbalanced.
+ */
+ if (eu_max - n_disabled == 7)
+ info->subslice_7eu[s] |= 1 << ss;
+
+ info->eu_total += eu_max - n_disabled;
+ }
+ }
+
+ /*
+ * SKL is expected to always have a uniform distribution
+ * of EU across subslices with the exception that any one
+ * EU in any one subslice may be fused off for die
+ * recovery.
+ */
+ info->eu_per_subslice = info->subslice_total ?
+ DIV_ROUND_UP(info->eu_total,
+ info->subslice_total) : 0;
+ /*
+ * SKL supports slice power gating on devices with more than
+ * one slice, and supports EU power gating on devices with
+ * more than one EU pair per subslice.
+ */
+ info->has_slice_pg = (info->slice_total > 1) ? 1 : 0;
+ info->has_subslice_pg = 0;
+ info->has_eu_pg = (info->eu_per_subslice > 2) ? 1 : 0;
+}
+
/*
* Determine various intel_device_info fields at runtime.
*
@@ -624,116 +745,11 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
}

/* Initialize slice/subslice/EU info */
- if (IS_CHERRYVIEW(dev)) {
- u32 fuse, eu_dis;
-
- fuse = I915_READ(CHV_FUSE_GT);
+ if (IS_CHERRYVIEW(dev))
+ cherryview_sseu_info_init(dev);
+ else if (IS_SKYLAKE(dev))
+ gen9_sseu_info_init(dev);

- info->slice_total = 1;
-
- if (!(fuse & CHV_FGT_DISABLE_SS0)) {
- info->subslice_per_slice++;
- eu_dis = fuse & (CHV_FGT_EU_DIS_SS0_R0_MASK |
- CHV_FGT_EU_DIS_SS0_R1_MASK);
- info->eu_total += 8 - hweight32(eu_dis);
- }
-
- if (!(fuse & CHV_FGT_DISABLE_SS1)) {
- info->subslice_per_slice++;
- eu_dis = fuse & (CHV_FGT_EU_DIS_SS1_R0_MASK |
- CHV_FGT_EU_DIS_SS1_R1_MASK);
- info->eu_total += 8 - hweight32(eu_dis);
- }
-
- info->subslice_total = info->subslice_per_slice;
- /*
- * CHV expected to always have a uniform distribution of EU
- * across subslices.
- */
- info->eu_per_subslice = info->subslice_total ?
- info->eu_total / info->subslice_total :
- 0;
- /*
- * CHV supports subslice power gating on devices with more than
- * one subslice, and supports EU power gating on devices with
- * more than one EU pair per subslice.
- */
- info->has_slice_pg = 0;
- info->has_subslice_pg = (info->subslice_total > 1);
- info->has_eu_pg = (info->eu_per_subslice > 2);
- } else if (IS_SKYLAKE(dev)) {
- const int s_max = 3, ss_max = 4, eu_max = 8;
- int s, ss;
- u32 fuse2, eu_disable[s_max], s_enable, ss_disable;
-
- fuse2 = I915_READ(GEN8_FUSE2);
- s_enable = (fuse2 & GEN8_F2_S_ENA_MASK) >>
- GEN8_F2_S_ENA_SHIFT;
- ss_disable = (fuse2 & GEN9_F2_SS_DIS_MASK) >>
- GEN9_F2_SS_DIS_SHIFT;
-
- eu_disable[0] = I915_READ(GEN8_EU_DISABLE0);
- eu_disable[1] = I915_READ(GEN8_EU_DISABLE1);
- eu_disable[2] = I915_READ(GEN8_EU_DISABLE2);
-
- info->slice_total = hweight32(s_enable);
- /*
- * The subslice disable field is global, i.e. it applies
- * to each of the enabled slices.
- */
- info->subslice_per_slice = ss_max - hweight32(ss_disable);
- info->subslice_total = info->slice_total *
- info->subslice_per_slice;
-
- /*
- * Iterate through enabled slices and subslices to
- * count the total enabled EU.
- */
- for (s = 0; s < s_max; s++) {
- if (!(s_enable & (0x1 << s)))
- /* skip disabled slice */
- continue;
-
- for (ss = 0; ss < ss_max; ss++) {
- u32 n_disabled;
-
- if (ss_disable & (0x1 << ss))
- /* skip disabled subslice */
- continue;
-
- n_disabled = hweight8(eu_disable[s] >>
- (ss * eu_max));
-
- /*
- * Record which subslice(s) has(have) 7 EUs. we
- * can tune the hash used to spread work among
- * subslices if they are unbalanced.
- */
- if (eu_max - n_disabled == 7)
- info->subslice_7eu[s] |= 1 << ss;
-
- info->eu_total += eu_max - n_disabled;
- }
- }
-
- /*
- * SKL is expected to always have a uniform distribution
- * of EU across subslices with the exception that any one
- * EU in any one subslice may be fused off for die
- * recovery.
- */
- info->eu_per_subslice = info->subslice_total ?
- DIV_ROUND_UP(info->eu_total,
- info->subslice_total) : 0;
- /*
- * SKL supports slice power gating on devices with more than
- * one slice, and supports EU power gating on devices with
- * more than one EU pair per subslice.
- */
- info->has_slice_pg = (info->slice_total > 1) ? 1 : 0;
- info->has_subslice_pg = 0;
- info->has_eu_pg = (info->eu_per_subslice > 2) ? 1 : 0;
- }
DRM_DEBUG_DRIVER("slice total: %u\n", info->slice_total);
DRM_DEBUG_DRIVER("subslice total: %u\n", info->subslice_total);
DRM_DEBUG_DRIVER("subslice per slice: %u\n", info->subslice_per_slice);