2 clflushes on two different objects are not ordered, and so do not
belong to the same timeline (context). Either we use a unique context
for each, or we reserve a special global context to mean unordered.
Ideally, we would reserve 0 to mean unordered (DMA_FENCE_NO_CONTEXT) to
have the same semantics everywhere.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_gem_clflush.c | 8 +-------
drivers/gpu/drm/i915/i915_gem_clflush.h | 1 -
4 files changed, 4 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 357b6c6c2f04..a11d7d8f5f2e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1514,6 +1514,8 @@ struct i915_gem_mm {
/** LRU list of objects with fence regs on them. */
struct list_head fence_list;
+ u64 unordered_timeline;
+
/* the indicator for dispatch video commands on two BSD rings */
atomic_t bsd_engine_dispatch_index;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 488ca7733c1e..1b100fa2a11c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4768,7 +4768,7 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
mutex_lock(&dev_priv->drm.struct_mutex);
- i915_gem_clflush_init(dev_priv);
+ dev_priv->mm.unordered_timeline = dma_fence_context_alloc(1);
if (!i915.enable_execlists) {
dev_priv->gt.resume = intel_legacy_submission_resume;
diff --git a/drivers/gpu/drm/i915/i915_gem_clflush.c b/drivers/gpu/drm/i915/i915_gem_clflush.c
index a895643c4dc4..17b207e963c2 100644
--- a/drivers/gpu/drm/i915/i915_gem_clflush.c
+++ b/drivers/gpu/drm/i915/i915_gem_clflush.c
@@ -27,7 +27,6 @@
#include "i915_gem_clflush.h"
static DEFINE_SPINLOCK(clflush_lock);
-static u64 clflush_context;
struct clflush {
struct dma_fence dma; /* Must be first for dma_fence_free() */
@@ -154,7 +153,7 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
dma_fence_init(&clflush->dma,
&i915_clflush_ops,
&clflush_lock,
- clflush_context,
+ to_i915(obj->base.dev)->mm.unordered_timeline,
0);
i915_sw_fence_init(&clflush->wait, i915_clflush_notify);
@@ -181,8 +180,3 @@ void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
obj->cache_dirty = false;
}
-
-void i915_gem_clflush_init(struct drm_i915_private *i915)
-{
- clflush_context = dma_fence_context_alloc(1);
-}
diff --git a/drivers/gpu/drm/i915/i915_gem_clflush.h b/drivers/gpu/drm/i915/i915_gem_clflush.h
index b62d61a2d15f..2455a7820937 100644
--- a/drivers/gpu/drm/i915/i915_gem_clflush.h
+++ b/drivers/gpu/drm/i915/i915_gem_clflush.h
@@ -28,7 +28,6 @@
struct drm_i915_private;
struct drm_i915_gem_object;
-void i915_gem_clflush_init(struct drm_i915_private *i915);
void i915_gem_clflush_object(struct drm_i915_gem_object *obj,
unsigned int flags);
#define I915_CLFLUSH_FORCE BIT(0)
--
2.11.0
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