[PATCH] drm/i915: Drop stealing of bits from i915_sw_fence function pointer

* [PATCH] drm/i915: Drop stealing of bits from i915_sw_fence function pointer
@ 2021-09-22  2:13 ` Matthew Brost
  0 siblings, 0 replies; 6+ messages in thread
From: Matthew Brost @ 2021-09-22  2:13 UTC (permalink / raw)
  To: intel-gfx, dri-devel; +Cc: jani.nikula, lucas.demarchi, tvrtko.ursulin

Rather than stealing bits from i915_sw_fence function pointer use
seperate fields for function pointer and flags. If using two different
fields, the 4 byte alignment for the i915_sw_fence function pointer can
also be dropped.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c  |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_context.c   |  2 +-
 drivers/gpu/drm/i915/i915_request.c           |  4 ++--
 drivers/gpu/drm/i915/i915_sw_fence.c          |  9 +++-----
 drivers/gpu/drm/i915/i915_sw_fence.h          | 21 +++++++++----------
 drivers/gpu/drm/i915/i915_sw_fence_work.c     |  2 +-
 .../gpu/drm/i915/selftests/i915_sw_fence.c    |  2 +-
 drivers/gpu/drm/i915/selftests/lib_sw_fence.c |  4 ++--
 8 files changed, 21 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a7ca38613f89..6d5bb55ffc82 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -10323,7 +10323,7 @@ static void intel_atomic_commit_work(struct work_struct *work)
 	intel_atomic_commit_tail(state);
 }
 
-static int __i915_sw_fence_call
+static int
 intel_atomic_commit_ready(struct i915_sw_fence *fence,
 			  enum i915_sw_fence_notify notify)
 {
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index c2ab0e22db0a..df5fec5c3da8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -800,7 +800,7 @@ static void free_engines_rcu(struct rcu_head *rcu)
 	free_engines(engines);
 }
 
-static int __i915_sw_fence_call
+static int
 engines_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	struct i915_gem_engines *engines =
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index ce446716d092..945d3025a0b6 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -719,7 +719,7 @@ void i915_request_cancel(struct i915_request *rq, int error)
 	intel_context_cancel_request(rq->context, rq);
 }
 
-static int __i915_sw_fence_call
+static int
 submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	struct i915_request *request =
@@ -755,7 +755,7 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 	return NOTIFY_DONE;
 }
 
-static int __i915_sw_fence_call
+static int
 semaphore_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	struct i915_request *rq = container_of(fence, typeof(*rq), semaphore);
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
index c589a681da77..5cf101cf06d2 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -34,7 +34,7 @@ enum {
 
 static void *i915_sw_fence_debug_hint(void *addr)
 {
-	return (void *)(((struct i915_sw_fence *)addr)->flags & I915_SW_FENCE_MASK);
+	return (void *)(((struct i915_sw_fence *)addr)->fn);
 }
 
 #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
@@ -126,10 +126,7 @@ static inline void debug_fence_assert(struct i915_sw_fence *fence)
 static int __i915_sw_fence_notify(struct i915_sw_fence *fence,
 				  enum i915_sw_fence_notify state)
 {
-	i915_sw_fence_notify_t fn;
-
-	fn = (i915_sw_fence_notify_t)(fence->flags & I915_SW_FENCE_MASK);
-	return fn(fence, state);
+	return fence->fn(fence, state);
 }
 
 #ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
@@ -242,7 +239,7 @@ void __i915_sw_fence_init(struct i915_sw_fence *fence,
 			  const char *name,
 			  struct lock_class_key *key)
 {
-	BUG_ON(!fn || (unsigned long)fn & ~I915_SW_FENCE_MASK);
+	BUG_ON(!fn);
 
 	__init_waitqueue_head(&fence->wait, name, key);
 	fence->flags = (unsigned long)fn;
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h
index 30a863353ee6..70ba1789aa89 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.h
+++ b/drivers/gpu/drm/i915/i915_sw_fence.h
@@ -17,26 +17,25 @@
 
 struct completion;
 struct dma_resv;
+struct i915_sw_fence;
+
+enum i915_sw_fence_notify {
+	FENCE_COMPLETE,
+	FENCE_FREE
+};
+
+typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
+				      enum i915_sw_fence_notify state);
 
 struct i915_sw_fence {
 	wait_queue_head_t wait;
+	i915_sw_fence_notify_t fn;
 	unsigned long flags;
 	atomic_t pending;
 	int error;
 };
 
 #define I915_SW_FENCE_CHECKED_BIT	0 /* used internally for DAG checking */
-#define I915_SW_FENCE_PRIVATE_BIT	1 /* available for use by owner */
-#define I915_SW_FENCE_MASK		(~3)
-
-enum i915_sw_fence_notify {
-	FENCE_COMPLETE,
-	FENCE_FREE
-};
-
-typedef int (*i915_sw_fence_notify_t)(struct i915_sw_fence *,
-				      enum i915_sw_fence_notify state);
-#define __i915_sw_fence_call __aligned(4)
 
 void __i915_sw_fence_init(struct i915_sw_fence *fence,
 			  i915_sw_fence_notify_t fn,
diff --git a/drivers/gpu/drm/i915/i915_sw_fence_work.c b/drivers/gpu/drm/i915/i915_sw_fence_work.c
index 5b33ef23d54c..d2e56b387993 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence_work.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence_work.c
@@ -23,7 +23,7 @@ static void fence_work(struct work_struct *work)
 	dma_fence_put(&f->dma);
 }
 
-static int __i915_sw_fence_call
+static int
 fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
diff --git a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
index cbf45d85cbff..daa985e5a19b 100644
--- a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
@@ -28,7 +28,7 @@
 
 #include "../i915_selftest.h"
 
-static int __i915_sw_fence_call
+static int
 fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	switch (state) {
diff --git a/drivers/gpu/drm/i915/selftests/lib_sw_fence.c b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
index 080b90b63d16..eb59a41bdb79 100644
--- a/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
+++ b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c
@@ -26,7 +26,7 @@
 
 /* Small library of different fence types useful for writing tests */
 
-static int __i915_sw_fence_call
+static int
 nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	return NOTIFY_DONE;
@@ -89,7 +89,7 @@ struct heap_fence {
 	};
 };
 
-static int __i915_sw_fence_call
+static int
 heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
 {
 	struct heap_fence *h = container_of(fence, typeof(*h), fence);
-- 
2.32.0


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