drm/i915: Assert that the kernel_context is hw-id 0
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@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170123113132.18665-1-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 17f90c6..77458da 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -451,6 +451,11 @@
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;