drm/i915: Taint the kernel on dumping the GEM ftrace buffer

As the ftrace buffer is single shot, once dumped it will not update. As
such, it only provides information for the first bug and all subsequent
bugs are noise. The goal of CI is to have zero bugs, so taint the kernel
causing CI to reboot the machine; fix the bug and move on.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191110185806.17413-13-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index f6f9675848b8e4b77fbcb2eb163a852cfb24850e..36a8c7673c4f8cd27114047608decb3209f697f9 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -68,9 +68,10 @@ struct drm_i915_private;
        pr_err(__VA_ARGS__);                                            \
        trace_printk(__VA_ARGS__);                                      \
 } while (0)
-#define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL)
+#define GEM_TRACE_DUMP() \
+       do { ftrace_dump(DUMP_ALL); add_taint_for_CI(TAINT_WARN); } while (0)
 #define GEM_TRACE_DUMP_ON(expr) \
-       do { if (expr) ftrace_dump(DUMP_ALL); } while (0)
+       do { if (expr) GEM_TRACE_DUMP(); } while (0)
 #else
 #define GEM_TRACE(...) do { } while (0)
 #define GEM_TRACE_ERR(...) do { } while (0)