[RFC PATCH 065/162] drm/i915/selftests: Prepare timeline tests for obj->mm.lock removal

[Matthew Auld]

From: Maarten Lankhorst <maarten.lankho...@linux.intel.com>

We can no longer call intel_timeline_pin with a null argument,
so add a ww loop that locks the backing object.

Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Thomas Hellström <thomas.hellst...@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/selftest_timeline.c | 28 ++++++++++++++++++---
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c 
b/drivers/gpu/drm/i915/gt/selftest_timeline.c
index 7435abf5a703..d468147a03de 100644
--- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
@@ -37,6 +37,26 @@ static unsigned long hwsp_cacheline(struct intel_timeline 
*tl)
        return (address + offset_in_page(tl->hwsp_offset)) / CACHELINE_BYTES;
 }
 
+static int selftest_tl_pin(struct intel_timeline *tl)
+{
+       struct i915_gem_ww_ctx ww;
+       int err;
+
+       i915_gem_ww_ctx_init(&ww, false);
+retry:
+       err = i915_gem_object_lock(tl->hwsp_ggtt->obj, &ww);
+       if (!err)
+               err = intel_timeline_pin(tl, &ww);
+
+       if (err == -EDEADLK) {
+               err = i915_gem_ww_ctx_backoff(&ww);
+               if (!err)
+                       goto retry;
+       }
+       i915_gem_ww_ctx_fini(&ww);
+       return err;
+}
+
 #define CACHELINES_PER_PAGE (PAGE_SIZE / CACHELINE_BYTES)
 
 struct mock_hwsp_freelist {
@@ -78,7 +98,7 @@ static int __mock_hwsp_timeline(struct mock_hwsp_freelist 
*state,
                if (IS_ERR(tl))
                        return PTR_ERR(tl);
 
-               err = intel_timeline_pin(tl, NULL);
+               err = selftest_tl_pin(tl);
                if (err) {
                        intel_timeline_put(tl);
                        return err;
@@ -464,7 +484,7 @@ checked_tl_write(struct intel_timeline *tl, struct 
intel_engine_cs *engine, u32
        struct i915_request *rq;
        int err;
 
-       err = intel_timeline_pin(tl, NULL);
+       err = selftest_tl_pin(tl);
        if (err) {
                rq = ERR_PTR(err);
                goto out;
@@ -664,7 +684,7 @@ static int live_hwsp_wrap(void *arg)
        if (!tl->has_initial_breadcrumb || !tl->hwsp_cacheline)
                goto out_free;
 
-       err = intel_timeline_pin(tl, NULL);
+       err = selftest_tl_pin(tl);
        if (err)
                goto out_free;
 
@@ -811,7 +831,7 @@ static int setup_watcher(struct hwsp_watcher *w, struct 
intel_gt *gt)
        if (IS_ERR(obj))
                return PTR_ERR(obj);
 
-       w->map = i915_gem_object_pin_map(obj, I915_MAP_WB);
+       w->map = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB);
        if (IS_ERR(w->map)) {
                i915_gem_object_put(obj);
                return PTR_ERR(w->map);
-- 
2.26.2

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