[PATCH 1/9] drm/i915: Assert that the kernel_context is hw-id 0

[Chris Wilson]

For easy recognisability, we want the kernel context to have id 0 and
all user contexts to have non-zero ids.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 17f90c618208..77458da9627d 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -451,6 +451,11 @@ int i915_gem_context_init(struct drm_i915_private *dev_priv)
 		return PTR_ERR(ctx);
 	}
 
+	/* For easy recognisablity, we want the kernel context to be 0 and then
+	 * all user contexts will have non-zero hw_id.
+	 */
+	GEM_BUG_ON(ctx->hw_id);
+
 	i915_gem_context_clear_bannable(ctx);
 	ctx->priority = I915_PRIORITY_MIN; /* lowest priority; idle task */
 	dev_priv->kernel_context = ctx;
-- 
2.11.0