[PATCH 15/25] drm/i915: Take ggtt lock around entirety of i915_gem_object_ggtt_pin

[Maarten Lankhorst]

We're preparing to require object lock for unbind, so we need to kill
off all unlocked callers, i915_gem_object_ggtt_pin_ww was one of them,
so take the lock around it.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  7 ++-----
 drivers/gpu/drm/i915/i915_gem.c | 27 +++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 68c4d7ef0ffe..1cf3032aadad 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1800,13 +1800,10 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
 			    const struct i915_ggtt_view *view,
 			    u64 size, u64 alignment, u64 flags);
 
-static inline struct i915_vma * __must_check
+struct i915_vma * __must_check
 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 const struct i915_ggtt_view *view,
-			 u64 size, u64 alignment, u64 flags)
-{
-	return i915_gem_object_ggtt_pin_ww(obj, NULL, view, size, alignment, flags);
-}
+			 u64 size, u64 alignment, u64 flags);
 
 int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
 			   unsigned long flags);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 590efc8b0265..ab704900c025 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -936,10 +936,7 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
 			return ERR_PTR(ret);
 	}
 
-	if (ww)
-		ret = i915_vma_pin_ww(vma, ww, size, alignment, flags | PIN_GLOBAL);
-	else
-		ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
+	ret = i915_vma_pin_ww(vma, ww, size, alignment, flags | PIN_GLOBAL);
 
 	if (ret)
 		return ERR_PTR(ret);
@@ -959,6 +956,28 @@ i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj,
 	return vma;
 }
 
+struct i915_vma *
+i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
+			 const struct i915_ggtt_view *view,
+			 u64 size, u64 alignment, u64 flags)
+{
+	struct i915_vma *vma = ERR_PTR(-ENODEV);
+	struct i915_gem_ww_ctx ww;
+	int err;
+
+	for_i915_gem_ww(&ww, err, true) {
+		err = i915_gem_object_lock(obj, &ww);
+		if (!err) {
+			vma = i915_gem_object_ggtt_pin_ww(obj, &ww, view, size,
+							  alignment, flags);
+			if (IS_ERR(vma))
+				err = PTR_ERR(vma);
+		}
+	}
+
+	return err ? ERR_PTR(err) : vma;
+}
+
 int
 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv)
-- 
2.33.0