[Intel-gfx] [PATCH 3/6] drm/i915: Add enable_sagv option

Lyude cpaul at redhat.com
Wed Oct 5 15:33:13 UTC 2016


This option allows us to manually control the SAGV at module load time.
This can be useful in situations such as trying to debug watermark
changes, since enabled SAGV + incorrect watermarks = total GPU
annihilation.

Signed-off-by: Lyude <cpaul at redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/i915_params.c   |  5 +++++
 drivers/gpu/drm/i915/i915_params.h   |  1 +
 drivers/gpu/drm/i915/intel_display.c | 16 +++++++++++++---
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 768ad89..f462cd4 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -62,6 +62,7 @@ struct i915_params i915 __read_mostly = {
 	.inject_load_failure = 0,
 	.enable_dpcd_backlight = false,
 	.enable_gvt = false,
+	.enable_sagv = -1,
 };
 
 module_param_named(modeset, i915.modeset, int, 0400);
@@ -233,3 +234,7 @@ MODULE_PARM_DESC(enable_dpcd_backlight,
 module_param_named(enable_gvt, i915.enable_gvt, bool, 0400);
 MODULE_PARM_DESC(enable_gvt,
 	"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
+
+module_param_named_unsafe(enable_sagv, i915.enable_sagv, int, 0400);
+MODULE_PARM_DESC(enable_sagv,
+	"Enable the SAGV (gen9+ only)(1=enabled, 0=disabled, -1=driver discretion [default])");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 3a0dd78..a7db125 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -65,6 +65,7 @@ struct i915_params {
 	bool enable_dp_mst;
 	bool enable_dpcd_backlight;
 	bool enable_gvt;
+	int enable_sagv;
 };
 
 extern struct i915_params i915 __read_mostly;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a71d05a..dd15ae2 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -16904,12 +16904,22 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
 		pll->on = false;
 	}
 
-	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
+	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
 		vlv_wm_get_hw_state(dev);
-	else if (IS_GEN9(dev))
+	} else if (IS_GEN9(dev)) {
 		skl_wm_get_hw_state(dev);
-	else if (HAS_PCH_SPLIT(dev))
+
+		if (i915.enable_sagv != -1) {
+			if (i915.enable_sagv)
+				intel_enable_sagv(dev_priv);
+			else
+				intel_disable_sagv(dev_priv);
+
+			dev_priv->sagv_status = I915_SAGV_NOT_CONTROLLED;
+		}
+	} else if (HAS_PCH_SPLIT(dev)) {
 		ilk_wm_get_hw_state(dev);
+	}
 
 	for_each_intel_crtc(dev, crtc) {
 		unsigned long put_domains;
-- 
2.7.4



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