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

Rather than stealing bits from i915_sw_fence function pointer use
separate 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.

v2:
 (CI)
  - Set new function field rather than flags in __i915_sw_fence_init
v3:
 (Tvrtko)
  - Remove BUG_ON(!fence->flags) in reinit as that will now blow up
  - Only define fence->flags if CONFIG_DRM_I915_SW_FENCE_CHECK_DAG is
    defined
v4:
  - Rebase, resend for CI

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211116194929.10211-1-matthew.brost@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index ec403e4..17057bc 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -9967,7 +9967,7 @@ 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 fb33d03..a534218 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1001,7 +1001,7 @@ 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/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index 268c51f..ba083d8 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -364,7 +364,7 @@ static int __intel_context_active(struct i915_active *active)
        return 0;
 }
 
-static int __i915_sw_fence_call
+static int
 sw_fence_dummy_notify(struct i915_sw_fence *sf,
                      enum i915_sw_fence_notify state)
 {

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index a72c8f0..825a94b 100644 (file)
--- 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 7ea0dbf..2a74a9a 100644 (file)
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -18,7 +18,9 @@
 #define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
 #endif
 
+#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
 static DEFINE_SPINLOCK(i915_sw_fence_lock);
+#endif
 
 #define WQ_FLAG_BITS \
        BITS_PER_TYPE(typeof_member(struct wait_queue_entry, flags))
@@ -34,7 +36,7 @@ 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 +128,7 @@ 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
@@ -242,10 +241,13 @@ 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;
+       fence->fn = fn;
+#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
+       fence->flags = 0;
+#endif
 
        i915_sw_fence_reinit(fence);
 }
@@ -257,7 +259,6 @@ void i915_sw_fence_reinit(struct i915_sw_fence *fence)
        atomic_set(&fence->pending, 1);
        fence->error = 0;
 
-       I915_SW_FENCE_BUG_ON(!fence->flags);
        I915_SW_FENCE_BUG_ON(!list_empty(&fence->wait.head));
 }
 
@@ -279,6 +280,7 @@ static int i915_sw_fence_wake(wait_queue_entry_t *wq, unsigned mode, int flags,
        return 0;
 }
 
+#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
 static bool __i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
                                    const struct i915_sw_fence * const signaler)
 {
@@ -322,9 +324,6 @@ static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
        unsigned long flags;
        bool err;
 
-       if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
-               return false;
-
        spin_lock_irqsave(&i915_sw_fence_lock, flags);
        err = __i915_sw_fence_check_if_after(fence, signaler);
        __i915_sw_fence_clear_checked_bit(fence);
@@ -332,6 +331,13 @@ static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
 
        return err;
 }
+#else
+static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
+                                        const struct i915_sw_fence * const signaler)
+{
+       return false;
+}
+#endif
 
 static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
                                          struct i915_sw_fence *signaler,

diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h
index 30a8633..a7c603b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_sw_fence.h
+++ b/drivers/gpu/drm/i915/i915_sw_fence.h
@@ -17,26 +17,27 @@
 
 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;
+#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG
        unsigned long flags;
+#endif
        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 5b33ef2..d2e56b3 100644 (file)
--- 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 cbf45d8..daa985e 100644 (file)
--- 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 080b90b..bf2752c 100644 (file)
--- 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;
@@ -41,12 +41,12 @@ void __onstack_fence_init(struct i915_sw_fence *fence,
        __init_waitqueue_head(&fence->wait, name, key);
        atomic_set(&fence->pending, 1);
        fence->error = 0;
-       fence->flags = (unsigned long)nop_fence_notify;
+       fence->fn = nop_fence_notify;
 }
 
 void onstack_fence_fini(struct i915_sw_fence *fence)
 {
-       if (!fence->flags)
+       if (!fence->fn)
                return;
 
        i915_sw_fence_commit(fence);
@@ -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);