Fixed grant bug

Just becasue we have a grant id doesn't mean that anything has actually
been granted...

bs/Bus/Bus.bs

@@ -14,16 +14,14 @@ import FIFOF
 import SpecialFIFOs
 import Printf
 
-busRequestToAddr :: BusRequest -> Addr
+-- Creates a Bus Module that supports multiple clients and servers
-busRequestToAddr req = case req of
-    BusReadRequest (ReadRequest addr _) -> addr
-    BusWriteRequest (WriteRequest addr _) -> addr
-
--- Create a Bus Module that supports multiple clients and servers
 -- submitting requests and simultaneously returning responses.
--- Responses can be consumed by clients out of order as all client
+-- Responses can be consumed by clients out of order(useful when some
--- submitted requests are tagged - and servers keep that tag
+-- servers respond before others) as all client submitted requests are
--- when responding.
+-- tagged with tags that are unique for the duration of the transaction
+--  - and well-behaved servers should keep that tag when responding.
+
+-- Explicitly inform the compiler that log2 n <= log2(n + 1)
 mkBus :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
       => (Addr -> Maybe (MkServerIdx numServers))
       -> Module (Bus inFlightTransactions numClients numServers)
@@ -32,13 +30,15 @@ mkBus serverMap = do
     tagEngineByClientVec :: Vector numClients (TagEngine inFlightTransactions)
     tagEngineByClientVec <- replicateM mkTagEngine
 
-    -- There are `numClients` clients, each of which needs its own arbiter as
+    -- There are `numClients` clients, each of which needs its own client 
-    -- there are up to `numServer` servers that may wish to submit a response
+    -- response arbiter as there are `numServer` servers that may wish to 
-    -- to a given client. Furthermore the rule that routes client requests to
+    -- submit a response to a given client. Furthermore the rule that routes
-    -- servers makes for another potential requestor as it may determine that
+    -- client requests to servers makes for another potential submitter to
-    -- a request is unmappable and instead opt to form and submit a
+    -- the client response arbiter as it may determine that a request is
-    -- `BusError UnMapped` response directly to a client response arbiter. Thus
+    -- unmappable and simply bypass submitting the request to a server,
-    -- we must arbit between a total of `numServers + 1` requestors.
+    -- instead opting to form a `BusError UnMapped` response to be submitted
+    -- directly to a client response arbiter. Thus the client response arbiter
+    -- must arbit between a total of `numServers + 1` requestors.
     responseArbiterByClient :: Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
     responseArbiterByClient <- replicateM (mkArbiter False)
 
@@ -48,9 +48,6 @@ mkBus serverMap = do
     requestArbiterByServer :: Vector numServers (Arbiter.Arbiter_IFC numClients)
     requestArbiterByServer <- replicateM (mkArbiter False)
 
-    dummyVar :: Reg(Bool)
-    dummyVar <- mkReg False
-
     -- Queues to hold requests from clients
     clientRequestQueues :: Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
     clientRequestQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
@@ -59,8 +56,11 @@ mkBus serverMap = do
     clientResponseQueues :: Vector numClients (FIFOF (TaggedBusResponse inFlightTransactions))
     clientResponseQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
 
-    -- The following two vectors of FIFOs make it easier to push/pull data to/from internal
+    -- The following two vectors of single depth FIFOs make it easier to push/pull data 
-    -- server methods:
+    -- to/from internal server methods as they provide back-pressure in both directions,
+    -- and behave as a wire when queue is empty.
+    -- If looking at the example bus.drawio diagram, the following two vectors effectively
+    -- correspond to the two arrows going from the blue box to the servers.
     consumeRequestQueues :: Vector numServers (
                                         FIFOF (
                                             MkClientTagType numClients,

bs/Bus/Client.bs

@@ -45,6 +45,9 @@ clientRouteRequest clientIdx clientReqQueue requestArbiterByServer responseArbit
                         arbiterClientSlot :: Arbiter.ArbiterClient_IFC
                         arbiterClientSlot = select targetServerArbiter.clients clientIdx
                     arbiterClientSlot.request
+                -- We bypass sensing the request to the server instead option to form
+                -- a `BusError Unmapped` response which we request to send directly to
+                -- the appropiate client response queue.
                 Nothing -> do
                     let targetClientResponseArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
                         targetClientResponseArbiter = select responseArbiterByClient clientIdx
@@ -74,12 +77,15 @@ clientArbitSubmission :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
                      -> Vector numServers (FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions))
                      -> Rules
 clientArbitSubmission clientIdx clientReqQueue clientRespQueue clientRespArbiter submitRespQueues =
-    rules
+    let grantedIdx :: UInt (TLog (TAdd numServers 1))
-        (sprintf "client[%d] arbit submission" clientIdx): when True ==> do
+        grantedIdx = unpack clientRespArbiter.grant_id
-            let grantedIdx :: UInt (TLog (TAdd numServers 1))
-                grantedIdx = unpack clientRespArbiter.grant_id
 
-                isClientRequest :: Bool
+        selectedServerInterface :: ArbiterClient_IFC
+        selectedServerInterface = select clientRespArbiter.clients grantedIdx
+    in
+    rules
+        (sprintf "client[%d] arbit submission" clientIdx): when selectedServerInterface.grant ==> do
+            let isClientRequest :: Bool
                 isClientRequest = grantedIdx == fromInteger (valueOf numServers)
             if isClientRequest then do
                 let clientRequest :: TaggedBusRequest inFlightTransactions

bs/Bus/Server.bs

@@ -14,25 +14,6 @@ import FIFOF
 import SpecialFIFOs
 import Printf
 
-serverArbitRequests :: Integer
-                   -> Arbiter.Arbiter_IFC numClients
-                   -> FIFOF (MkClientTagType numClients, TaggedBusRequest inFlightTransactions)
-                   -> Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
-                   -> Rules
-serverArbitRequests serverIdx serverArbiter consumeReqQueue clientReqQueues =
-    rules
-        (sprintf "server[%d] arbit requests" serverIdx): when True ==> do
-            let grantedClientIdx :: MkClientTagType numClients
-                grantedClientIdx = unpack serverArbiter.grant_id
-
-                selectedClientReqQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
-                selectedClientReqQueue = select clientReqQueues grantedClientIdx
-
-                clientRequest :: TaggedBusRequest inFlightTransactions
-                clientRequest = selectedClientReqQueue.first
-            consumeReqQueue.enq (grantedClientIdx, clientRequest)
-            selectedClientReqQueue.deq
-
 serverRouteResponse :: Integer
                    -> FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
                    -> Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
@@ -52,3 +33,25 @@ serverRouteResponse serverIdx submitRespQueue responseArbiterByClient =
                 arbiterClientSlot :: Arbiter.ArbiterClient_IFC
                 arbiterClientSlot = select targetClientRespArbiter.clients serverIdx
             arbiterClientSlot.request
+
+serverArbitRequests :: Integer
+                   -> Arbiter.Arbiter_IFC numClients
+                   -> FIFOF (MkClientTagType numClients, TaggedBusRequest inFlightTransactions)
+                   -> Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
+                   -> Rules
+serverArbitRequests serverIdx serverArbiter consumeReqQueue clientReqQueues =
+    let grantedClientIdx :: MkClientTagType numClients
+        grantedClientIdx = unpack serverArbiter.grant_id
+
+        selectedClientInterface :: ArbiterClient_IFC
+        selectedClientInterface = select serverArbiter.clients grantedClientIdx
+    in
+    rules
+        (sprintf "server[%d] arbit requests" serverIdx): when selectedClientInterface.grant ==> do
+            let selectedClientReqQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
+                selectedClientReqQueue = select clientReqQueues grantedClientIdx
+
+                clientRequest :: TaggedBusRequest inFlightTransactions
+                clientRequest = selectedClientReqQueue.first
+            consumeReqQueue.enq (grantedClientIdx, clientRequest)
+            selectedClientReqQueue.deq

diagrams/bus.drawio

@@ -1,75 +1,75 @@
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@@ -78,7 +78,7 @@
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@@ -91,20 +91,20 @@
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@@ -117,25 +117,25 @@
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@@ -417,6 +394,30 @@
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