[Intel-gfx] [PATCH] drm/i915/bdw: Check for slice, subslice and EU count for BDW
Łukasz Daniluk
lukasz.daniluk at intel.com
Thu Aug 13 05:38:48 PDT 2015
Added checks for available slices, subslices and EUs for Broadwell. This
information is filled in intel_device_info and is available to user with
GET_PARAM.
Added checks for enabled slices, subslices and EU for Broadwell. This
information is based on available counts but takes power gated slices
into account. It can be read in debugfs.
Introduce new register defines that contain information on slices on
Broadwell.
Cc: Jeff Mcgee <jeff.mcgee at intel.com>
Signed-off-by: Łukasz Daniluk <lukasz.daniluk at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 35 +++++++++++++--
drivers/gpu/drm/i915/i915_dma.c | 89 +++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 19 +++++++-
3 files changed, 138 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 23a69307..a17f912 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4838,7 +4838,6 @@ struct sseu_dev_status {
static void cherryview_sseu_device_status(struct drm_device *dev,
struct sseu_dev_status *stat)
{
- struct drm_i915_private *dev_priv = dev->dev_private;
const int ss_max = 2;
int ss;
u32 sig1[ss_max], sig2[ss_max];
@@ -4870,7 +4869,6 @@ static void cherryview_sseu_device_status(struct drm_device *dev,
static void gen9_sseu_device_status(struct drm_device *dev,
struct sseu_dev_status *stat)
{
- struct drm_i915_private *dev_priv = dev->dev_private;
int s_max = 3, ss_max = 4;
int s, ss;
u32 s_reg[s_max], eu_reg[2*s_max], eu_mask[2];
@@ -4932,13 +4930,42 @@ static void gen9_sseu_device_status(struct drm_device *dev,
}
}
+static void broadwell_sseu_device_status(struct drm_device *dev,
+ struct sseu_dev_status *stat)
+{
+ int s;
+ u32 slice_info = I915_READ(GEN8_R_PWR_CLK_STATE);
+
+ /*
+ * If first bit of slice_info is 0, there is no specific power
+ * state set. Otherwise we read the count of enabled slices
+ * from it.
+ */
+ if (slice_info & (1<<31))
+ stat->slice_total = (slice_info & GEN8_RPCS_S_CNT_MASK)
+ >> GEN8_RPCS_S_CNT_SHIFT;
+ else
+ stat->slice_total = INTEL_INFO(dev)->slice_total;
+
+ stat->subslice_per_slice = INTEL_INFO(dev)->subslice_per_slice;
+ stat->eu_per_subslice = INTEL_INFO(dev)->eu_per_subslice;
+ stat->subslice_total = stat->slice_total * stat->subslice_per_slice;
+ stat->eu_total = stat->eu_per_subslice * stat->subslice_total;
+
+ /* subtract fused off EU(s) from enabled slice(s) */
+ for (s = 0; s < stat.slice_total; s++) {
+ u8 subslice_7eu = INTEL_INFO(dev)->subslice_7eu[s];
+ stat->eu_total -= hweight8(subslice_7eu);
+ }
+}
+
static int i915_sseu_status(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct sseu_dev_status stat;
- if ((INTEL_INFO(dev)->gen < 8) || IS_BROADWELL(dev))
+ if ((INTEL_INFO(dev)->gen < 8))
return -ENODEV;
seq_puts(m, "SSEU Device Info\n");
@@ -4963,6 +4990,8 @@ static int i915_sseu_status(struct seq_file *m, void *unused)
memset(&stat, 0, sizeof(stat));
if (IS_CHERRYVIEW(dev)) {
cherryview_sseu_device_status(dev, &stat);
+ } else if (IS_BROADWELL(dev)) {
+ broadwell_sseu_device_status(dev, &stat);
} else if (INTEL_INFO(dev)->gen >= 9) {
gen9_sseu_device_status(dev, &stat);
}
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index ab37d11..2d52b1e 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -705,6 +705,93 @@ static void gen9_sseu_info_init(struct drm_device *dev)
info->has_eu_pg = (info->eu_per_subslice > 2);
}
+static void broadwell_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 = 3, 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 & GEN8_F2_SS_DIS_MASK) >>
+ GEN8_F2_SS_DIS_SHIFT;
+
+ eu_disable[0] = I915_READ(GEN8_EU_DISABLE0) &
+ GEN8_EU_DIS0_S0_MASK;
+ eu_disable[1] = (I915_READ(GEN8_EU_DISABLE0) >>
+ GEN8_EU_DIS0_S1_SHIFT) |
+ ((I915_READ(GEN8_EU_DISABLE1) &
+ GEN8_EU_DIS1_S1_MASK) <<
+ (32 - GEN8_EU_DIS0_S1_SHIFT));
+ eu_disable[2] = (I915_READ(GEN8_EU_DISABLE1) >>
+ GEN8_EU_DIS1_S2_SHIFT) |
+ ((I915_READ(GEN8_EU_DISABLE2) &
+ GEN8_EU_DIS2_S2_MASK) <<
+ (32 - GEN8_EU_DIS1_S2_SHIFT));
+
+
+ info = (struct intel_device_info *)&dev_priv->info;
+ 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;
+ }
+ }
+
+ /*
+ * BDW 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;
+
+ /*
+ * BDW supports slice power gating on devices with more than
+ * one slice.
+ */
+ info->has_slice_pg = (info->slice_total > 1);
+ info->has_subslice_pg = 0;
+ info->has_eu_pg = 0;
+}
+
/*
* Determine various intel_device_info fields at runtime.
*
@@ -775,6 +862,8 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
/* Initialize slice/subslice/EU info */
if (IS_CHERRYVIEW(dev))
cherryview_sseu_info_init(dev);
+ else if (IS_BROADWELL(dev))
+ broadwell_sseu_info_init(dev);
else if (INTEL_INFO(dev)->gen >= 9)
gen9_sseu_info_init(dev);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index be87e3b..77e043e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1841,11 +1841,26 @@ enum skl_disp_power_wells {
#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 GEN9_F2_SS_DIS_SHIFT 20
-#define GEN9_F2_SS_DIS_MASK (0xf << GEN9_F2_SS_DIS_SHIFT)
+#define GEN8_EU_DISABLE0 0x9134
+#define GEN8_EU_DIS0_S0_MASK 0xffffff
+#define GEN8_EU_DIS0_S1_SHIFT 24
+#define GEN8_EU_DIS0_S1_MASK (0xff << GEN8_EU_DIS0_S1_SHIFT)
+
+#define GEN8_EU_DISABLE1 0x9138
+#define GEN8_EU_DIS1_S1_MASK 0xffff
+#define GEN8_EU_DIS1_S2_SHIFT 16
+#define GEN8_EU_DIS1_S2_MASK (0xffff << GEN8_EU_DIS1_S2_SHIFT)
+
+#define GEN8_EU_DISABLE2 0x913c
+#define GEN8_EU_DIS2_S2_MASK 0xff
+
+#define GEN9_F2_SS_DIS_SHIFT 20
+#define GEN9_F2_SS_DIS_MASK (0xf << GEN9_F2_SS_DIS_SHIFT)
#define GEN9_EU_DISABLE(slice) (0x9134 + (slice)*0x4)
--
Lukasz Daniluk
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