Slice shutdown is a power savings feature whereby parts of HW i.e. slice is
shut off on boot or dynamically to save power.
This patch only introduces a way to disable half of Haswell GT3 slices on boot.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 5 +++++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 5 -----
drivers/gpu/drm/i915/i915_reg.h | 11 +++++++++++
drivers/gpu/drm/i915/intel_pm.c | 23 +++++++++++++++++++++++
5 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 72e2be7..2650071 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -154,6 +154,11 @@ module_param_named(prefault_disable, i915_prefault_disable, bool, 0600);
MODULE_PARM_DESC(prefault_disable,
"Disable page prefaulting for pread/pwrite/reloc (default:false). For developers only.");
+int i915_gt3_policy __read_mostly = 1;
+module_param_named(gt3_policy, i915_gt3_policy, int, 0600);
+MODULE_PARM_DESC(gt3_policy,
+ "GT3 boot with Full (1) or Half (0) slices enabled. (default:full)");
+
static struct drm_driver driver;
extern int intel_agp_enabled;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d648bfe..62bac41 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1743,6 +1743,7 @@ extern bool i915_fastboot __read_mostly;
extern int i915_enable_pc8 __read_mostly;
extern int i915_pc8_timeout __read_mostly;
extern bool i915_prefault_disable __read_mostly;
+extern int i915_gt3_policy __read_mostly;
extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 89c2844..5fcbaad 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4388,11 +4388,6 @@ i915_gem_init_hw(struct drm_device *dev)
if (dev_priv->ellc_size)
I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
- if (IS_HSW_GT3(dev))
- I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_ENABLED);
- else
- I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_DISABLED);
-
if (HAS_PCH_NOP(dev)) {
u32 temp = I915_READ(GEN7_MSG_CTL);
temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index bcaba63..dc2adcb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -269,6 +269,17 @@
#define LOWER_SLICE_ENABLED (1<<0)
#define LOWER_SLICE_DISABLED (0<<0)
+#define HSW_GT_SLICE_INFO 0x138064
+#define SLICE_SEL_BOTH (1<<3)
+#define SLICE_AUTOWAKE (1<<2)
+#define SLICE_STATUS_MASK 0x3
+#define SLICE_STATUS_GT_OFF (0<<0)
+#define SLICE_STATUS_MAIN_ON (2<<0)
+#define SLICE_STATUS_BOTH_ON (3<<0)
+
+#define HSW_SLICESHUTDOWN 0xA190
+#define SLICE_SHUTDOWN (1<<0)
+
/*
* 3D instructions used by the kernel
*/
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4af6c1e..2b9db88 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3697,6 +3697,28 @@ static void gen6_enable_rps(struct drm_device *dev)
gen6_gt_force_wake_put(dev_priv);
}
+static void intel_init_gt3_slices(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (!IS_HSW_GT3(dev))
+ return;
+
+ if (!i915_gt3_policy) {
+ I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_DISABLED);
+ POSTING_READ(MI_PREDICATE_RESULT_2);
+
+ I915_WRITE(HSW_SLICESHUTDOWN, SLICE_SHUTDOWN);
+ POSTING_READ(HSW_SLICESHUTDOWN);
+
+ I915_WRITE(HSW_GT_SLICE_INFO, ~SLICE_SEL_BOTH);
+ POSTING_READ(HSW_GT_SLICE_INFO);
+ } else {
+ I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_ENABLED);
+ POSTING_READ(MI_PREDICATE_RESULT_2);
+ }
+}
+
void gen6_update_ring_freq(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -4688,6 +4710,7 @@ static void intel_gen6_powersave_work(struct work_struct *work)
} else {
gen6_enable_rps(dev);
gen6_update_ring_freq(dev);
+ intel_init_gt3_slices(dev);
}
mutex_unlock(&dev_priv->rps.hw_lock);
}
--
1.8.1.4
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