drm/i915: Dump w/a lists on all engines

We store separate wa_list on every engine, so be sure to include all
when dumping the current set via debugfs.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703135805.7310-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2960,14 +2960,28 @@ static int i915_shared_dplls_info(struct seq_file *m, void *unused)
 static int i915_wa_registers(struct seq_file *m, void *unused)
 {
 	struct drm_i915_private *i915 = node_to_i915(m->private);
-	const struct i915_wa_list *wal = &i915->engine[RCS0]->ctx_wa_list;
-	struct i915_wa *wa;
-	unsigned int i;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, i915, id) {
+		const struct i915_wa_list *wal = &engine->ctx_wa_list;
+		const struct i915_wa *wa;
+		unsigned int count;
+
+		count = wal->count;
+		if (!count)
+			continue;
+
+		seq_printf(m, "%s: Workarounds applied: %u\n",
+			   engine->name, count);
 
-	seq_printf(m, "Workarounds applied: %u\n", wal->count);
-	for (i = 0, wa = wal->list; i < wal->count; i++, wa++)
+		for (wa = wal->list; count--; wa++)
 			seq_printf(m, "0x%X: 0x%08X, mask: 0x%08X\n",
-			   i915_mmio_reg_offset(wa->reg), wa->val, wa->mask);
+				   i915_mmio_reg_offset(wa->reg),
+				   wa->val, wa->mask);
+
+		seq_printf(m, "\n");
+	}
 
 	return 0;
 }