drm/i915: Move the ban period onto the context

This will allow us to set per-file, or even per-context, periods in the
future.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 9cd457a..3f6ca46 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2535,7 +2535,8 @@
 	if (ctx->hang_stats.banned)
 		return true;
 
-	if (elapsed <= DRM_I915_CTX_BAN_PERIOD) {
+	if (ctx->hang_stats.ban_period_seconds &&
+	    elapsed <= ctx->hang_stats.ban_period_seconds) {
 		if (!i915_gem_context_is_default(ctx)) {
 			DRM_DEBUG("context hanging too fast, banning!\n");
 			return true;