From 3ec0af7f223bab9503c4ed57d00ed34b137df476 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 9 Aug 2017 17:39:30 +0100
Subject: [PATCH] drm/i915: Supply the engine-id for our mock_engine()
Git-commit: 3ec0af7f223bab9503c4ed57d00ed34b137df476
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900

In the original selftest, we didn't care what the engine->id was, just
that it could uniquely identify it. Later though, we started tracking
the mock engines in the fixed size arrays around the drm_i915_private and
so we now require their indices to be correct. This becomes an issue when
using the standalone harness which runs all available tests at module load,
and so we quickly assign an out-of-bounds index to an engine as we
reallocate the mock GEM device between tests. It doesn't show up in
igt/drv_selftest as that runs each subtest individually.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102045
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170809163930.26470-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/selftests/mock_engine.c     |    8 +++++---
 drivers/gpu/drm/i915/selftests/mock_engine.h     |    3 ++-
 drivers/gpu/drm/i915/selftests/mock_gem_device.c |    2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -123,10 +123,12 @@ static struct intel_ring *mock_ring(stru
 }
 
 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
-				    const char *name)
+				    const char *name,
+				    int id)
 {
 	struct mock_engine *engine;
-	static int id;
+
+	GEM_BUG_ON(id >= I915_NUM_ENGINES);
 
 	engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
 	if (!engine)
@@ -141,7 +143,7 @@ struct intel_engine_cs *mock_engine(stru
 	/* minimal engine setup for requests */
 	engine->base.i915 = i915;
 	snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
-	engine->base.id = id++;
+	engine->base.id = id;
 	engine->base.status_page.page_addr = (void *)(engine + 1);
 
 	engine->base.context_pin = mock_context_pin;
--- a/drivers/gpu/drm/i915/selftests/mock_engine.h
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.h
@@ -40,7 +40,8 @@ struct mock_engine {
 };
 
 struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
-				    const char *name);
+				    const char *name,
+				    int id);
 void mock_engine_flush(struct intel_engine_cs *engine);
 void mock_engine_reset(struct intel_engine_cs *engine);
 void mock_engine_free(struct intel_engine_cs *engine);
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -226,7 +226,7 @@ struct drm_i915_private *mock_gem_device
 	mutex_unlock(&i915->drm.struct_mutex);
 
 	mkwrite_device_info(i915)->ring_mask = BIT(0);
-	i915->engine[RCS] = mock_engine(i915, "mock");
+	i915->engine[RCS] = mock_engine(i915, "mock", RCS);
 	if (!i915->engine[RCS])
 		goto err_priorities;