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authorAlan Stern <stern@rowland.harvard.edu>2019-04-22 12:17:58 -0400
committerPaul E. McKenney <paulmck@linux.ibm.com>2019-05-28 08:18:21 -0700
commitd1a84ab190137cc2a980b6979b1f2790d51b2d87 (patch)
tree083219522d9a0f94d7d092a794db8483fb961013 /tools
parent4494dd58fbb477e54c129c1d8ef477aad433eba0 (diff)
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tools/memory-model: Add definitions of plain and marked accesses
This patch adds definitions for marked and plain accesses to the Linux-Kernel Memory Model. It also modifies the definitions of the existing parts of the model (including the cumul-fence, prop, hb, pb, and rb relations) so as to make them apply only to marked accesses. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reviewed-by: Andrea Parri <andrea.parri@amarulasolutions.com> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/memory-model/linux-kernel.bell5
-rw-r--r--tools/memory-model/linux-kernel.cat16
2 files changed, 14 insertions, 7 deletions
diff --git a/tools/memory-model/linux-kernel.bell b/tools/memory-model/linux-kernel.bell
index def9131d3d8e..b60eb5a01053 100644
--- a/tools/memory-model/linux-kernel.bell
+++ b/tools/memory-model/linux-kernel.bell
@@ -76,3 +76,8 @@ flag ~empty rcu-rscs & (po ; [Sync-srcu] ; po) as invalid-sleep
(* Validate SRCU dynamic match *)
flag ~empty different-values(srcu-rscs) as srcu-bad-nesting
+
+(* Compute marked and plain memory accesses *)
+let Marked = (~M) | IW | Once | Release | Acquire | domain(rmw) | range(rmw) |
+ LKR | LKW | UL | LF | RL | RU
+let Plain = M \ Marked
diff --git a/tools/memory-model/linux-kernel.cat b/tools/memory-model/linux-kernel.cat
index 834107022c50..ff354e5ffd4b 100644
--- a/tools/memory-model/linux-kernel.cat
+++ b/tools/memory-model/linux-kernel.cat
@@ -65,19 +65,21 @@ let dep = addr | data
let rwdep = (dep | ctrl) ; [W]
let overwrite = co | fr
let to-w = rwdep | (overwrite & int)
-let to-r = addr | (dep ; rfi)
+let to-r = addr | (dep ; [Marked] ; rfi)
let ppo = to-r | to-w | fence | (po-unlock-rf-lock-po & int)
(* Propagation: Ordering from release operations and strong fences. *)
-let A-cumul(r) = rfe? ; r
-let cumul-fence = A-cumul(strong-fence | po-rel) | wmb | po-unlock-rf-lock-po
-let prop = (overwrite & ext)? ; cumul-fence* ; rfe?
+let A-cumul(r) = (rfe ; [Marked])? ; r
+let cumul-fence = [Marked] ; (A-cumul(strong-fence | po-rel) | wmb |
+ po-unlock-rf-lock-po) ; [Marked]
+let prop = [Marked] ; (overwrite & ext)? ; cumul-fence* ;
+ [Marked] ; rfe? ; [Marked]
(*
* Happens Before: Ordering from the passage of time.
* No fences needed here for prop because relation confined to one process.
*)
-let hb = ppo | rfe | ((prop \ id) & int)
+let hb = [Marked] ; (ppo | rfe | ((prop \ id) & int)) ; [Marked]
acyclic hb as happens-before
(****************************************)
@@ -85,7 +87,7 @@ acyclic hb as happens-before
(****************************************)
(* Propagation: Each non-rf link needs a strong fence. *)
-let pb = prop ; strong-fence ; hb*
+let pb = prop ; strong-fence ; hb* ; [Marked]
acyclic pb as propagation
(*******)
@@ -133,7 +135,7 @@ let rec rcu-fence = rcu-gp | srcu-gp |
(rcu-fence ; rcu-link ; rcu-fence)
(* rb orders instructions just as pb does *)
-let rb = prop ; po ; rcu-fence ; po? ; hb* ; pb*
+let rb = prop ; po ; rcu-fence ; po? ; hb* ; pb* ; [Marked]
irreflexive rb as rcu