[PATCH 2/6] drm/i915: expose _SUBSLICE_MASK GETPARM

[Robert Bragg <robert@sixbynine.org>]

Assuming a uniform mask across all slices, this enables userspace to
determine the specific sub slices enabled. This information is required,
for example, to be able to analyse some OA counter reports where the
counter configuration depends on the HW sub slice configuration.

Signed-off-by: Robert Bragg <robert@sixbynine.org>
---
 drivers/gpu/drm/i915/i915_drv.c | 5 +++++
 include/uapi/drm/i915_drm.h     | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index d391768f301b..a497537b42d3 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -364,6 +364,11 @@ static int i915_getparam(struct drm_device *dev, void *data,
 		if (!value)
 			return -ENODEV;
 		break;
+	case I915_PARAM_SUBSLICE_MASK:
+		value = INTEL_INFO(dev_priv)->sseu.subslice_mask;
+		if (!value)
+			return -ENODEV;
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index f47fb7f26f36..e0599e729e68 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -393,6 +393,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_MIN_EU_IN_POOL	 39
 #define I915_PARAM_MMAP_GTT_VERSION	 40
 #define I915_PARAM_SLICE_MASK		 45 /* XXX: rebase before landing */
+#define I915_PARAM_SUBSLICE_MASK	 46
 
 /* Query whether DRM_I915_GEM_EXECBUFFER2 supports user defined execution
  * priorities and the driver will attempt to execute batches in priority order.
-- 
2.11.1

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