drm/i915/guc: Decouple GuC engine id from ring id

Previously GuC uses ring id as engine id because of same definition.
But this is not true since this commit:

commit de1add360522c876c25ef2bbbbab1c94bdb509ab
Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Date:   Fri Jan 15 15:12:50 2016 +0000

    drm/i915: Decouple execbuf uAPI from internal implementation

Added GuC engine id into GuC interface to decouple it from ring id used
by driver.

v2: Keep ring name print out in debugfs; using for_each_ring() where
    possible to keep driver consistent. (Chris W.)

Signed-off-by: Alex Dai <yu.dai@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453579094-29860-1-git-send-email-yu.dai@intel.com
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index c5db235..cea1844 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2463,9 +2463,9 @@
 
 	for_each_ring(ring, dev_priv, i) {
 		seq_printf(m, "\tSubmissions: %llu %s\n",
-				client->submissions[i],
+				client->submissions[ring->guc_id],
 				ring->name);
-		tot += client->submissions[i];
+		tot += client->submissions[ring->guc_id];
 	}
 	seq_printf(m, "\tTotal: %llu\n", tot);
 }
@@ -2502,10 +2502,10 @@
 
 	seq_printf(m, "\nGuC submissions:\n");
 	for_each_ring(ring, dev_priv, i) {
-		seq_printf(m, "\t%-24s: %10llu, last seqno 0x%08x %9d\n",
-			ring->name, guc.submissions[i],
-			guc.last_seqno[i], guc.last_seqno[i]);
-		total += guc.submissions[i];
+		seq_printf(m, "\t%-24s: %10llu, last seqno 0x%08x\n",
+			ring->name, guc.submissions[ring->guc_id],
+			guc.last_seqno[ring->guc_id]);
+		total += guc.submissions[ring->guc_id];
 	}
 	seq_printf(m, "\t%s: %llu\n", "Total", total);