[Intel-gfx] [PATCH 3/4] drm/i915: add drm PARAM to query available cache levels

[Eugeni Dodonov]

From: Eugeni Dodonov <eugeni.dodonov at intel.com>

This allows to query available cache levels from libdrm and check for
presence of LLC from userspace.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c |    6 ++++++
 include/drm/i915_drm.h          |    1 +
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a9533c5..5ffbd95 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -781,6 +781,12 @@ static int i915_getparam(struct drm_device *dev, void *data,
 	case I915_PARAM_HAS_RELAXED_DELTA:
 		value = 1;
 		break;
+	case I915_PARAM_CACHE_LEVELS:
+		/* Everyone has CACHE_NONE but not everyone has LLC */
+		value = 1 << I915_CACHE_NONE;
+		if (HAS_LLC(dev))
+			value |= 1 << I915_CACHE_LLC;
+		break;
 	default:
 		DRM_DEBUG_DRIVER("Unknown parameter %d\n",
 				 param->param);
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index e9f1cf4..7f778f5 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -291,6 +291,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_COHERENT_RINGS	 13
 #define I915_PARAM_HAS_EXEC_CONSTANTS	 14
 #define I915_PARAM_HAS_RELAXED_DELTA	 15
+#define I915_PARAM_CACHE_LEVELS	 16
 
 typedef struct drm_i915_getparam {
 	int param;
-- 
1.7.7.4