224 lines
11 KiB
Haskell
224 lines
11 KiB
Haskell
package Bus(mkBus, Bus(..)) where
|
|
|
|
import Types
|
|
import BusTypes
|
|
import Client
|
|
import TagEngine
|
|
import Vector
|
|
import Util
|
|
import Arbiter
|
|
import FIFO
|
|
import FIFOF
|
|
import SpecialFIFOs
|
|
import Printf
|
|
|
|
busRequestToAddr :: BusRequest -> Addr
|
|
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
|
|
-- submitted requests are tagged - and servers keep that tag
|
|
-- when responding.
|
|
mkBus :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
|
|
=> (Addr -> Maybe (MkServerIdx numServers))
|
|
-> Module (Bus inFlightTransactions numClients numServers)
|
|
mkBus serverMap = do
|
|
-- Tag engines for each client to manage transaction tags
|
|
tagEngineByClientVec :: Vector numClients (TagEngine inFlightTransactions)
|
|
tagEngineByClientVec <- replicateM mkTagEngine
|
|
|
|
-- There are `numClients` clients, each of which needs its own arbiter as
|
|
-- there are up to `numServer` servers that may wish to submit a response
|
|
-- to a given client. Furthermore the rule that routes client requests to
|
|
-- servers makes for another potential requestor as it may determine that
|
|
-- a request is unmappable and instead opt to form and submit a
|
|
-- `BusError UnMapped` response directly to a client response arbiter. Thus
|
|
-- we must arbit between a total of `numServers + 1` requestors.
|
|
responseArbiterByClient :: Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
|
|
responseArbiterByClient <- replicateM (mkArbiter False)
|
|
|
|
-- There are `numServer` servers, each of which needs its own arbiter as
|
|
-- there are up to `numClient` clients that may wish to submit a response
|
|
-- to a given server.
|
|
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))
|
|
|
|
-- Queues to hold responses to clients
|
|
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
|
|
-- server methods:
|
|
consumeRequestQueues :: Vector numServers (
|
|
FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusRequest inFlightTransactions
|
|
)
|
|
)
|
|
consumeRequestQueues <- replicateM mkBypassFIFOF
|
|
|
|
submitResponseQueues :: Vector numServers (
|
|
FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusResponse inFlightTransactions
|
|
)
|
|
)
|
|
submitResponseQueues <- replicateM mkBypassFIFOF
|
|
|
|
let clientRules :: Vector numClients (Rules)
|
|
clientRules = genWith $ \clientIdx ->
|
|
let selectedClientReqQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
|
|
selectedClientReqQueue = select clientRequestQueues clientIdx
|
|
|
|
selectedClientRespQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
|
|
selectedClientRespQueue = select clientResponseQueues clientIdx
|
|
|
|
selectedClientRespArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
|
|
selectedClientRespArbiter = select responseArbiterByClient clientIdx
|
|
|
|
clientRouterRule :: Rules
|
|
clientRouterRule = clientRouteRequest
|
|
clientIdx
|
|
selectedClientReqQueue
|
|
requestArbiterByServer
|
|
responseArbiterByClient
|
|
serverMap
|
|
|
|
clientArbiterRule :: Rules
|
|
clientArbiterRule = clientArbitSubmission
|
|
clientIdx
|
|
selectedClientReqQueue
|
|
selectedClientRespQueue
|
|
selectedClientRespArbiter
|
|
submitResponseQueues
|
|
in
|
|
clientRouterRule <+> clientArbiterRule
|
|
|
|
let serverRules :: Vector numServers (Rules)
|
|
serverRules = genWith $ \serverIdx ->
|
|
let
|
|
selectedServerArbiter :: Arbiter.Arbiter_IFC numClients
|
|
selectedServerArbiter = (select requestArbiterByServer serverIdx)
|
|
|
|
selectedConsumeRequestQueue :: FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusRequest inFlightTransactions
|
|
)
|
|
selectedConsumeRequestQueue = (select consumeRequestQueues serverIdx)
|
|
in
|
|
rules
|
|
(sprintf "server[%d] arbit requests" serverIdx): when True ==> do
|
|
let
|
|
grantedClientIdx :: MkClientTagType numClients
|
|
grantedClientIdx = unpack selectedServerArbiter.grant_id
|
|
|
|
selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
|
|
selectedClientRequestQueue = (select clientRequestQueues grantedClientIdx)
|
|
|
|
clientRequest :: TaggedBusRequest inFlightTransactions
|
|
clientRequest = selectedClientRequestQueue.first
|
|
|
|
selectedConsumeRequestQueue.enq (grantedClientIdx, clientRequest)
|
|
selectedClientRequestQueue.deq
|
|
|
|
(sprintf "server[%d] route response" serverIdx): when True ==> do
|
|
let
|
|
selectedSubmitResponseQueue :: FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusResponse inFlightTransactions
|
|
)
|
|
selectedSubmitResponseQueue = (select submitResponseQueues serverIdx)
|
|
|
|
response :: (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
|
|
response = selectedSubmitResponseQueue.first
|
|
|
|
clientTag :: MkClientTagType numClients
|
|
clientTag = response.fst
|
|
|
|
targetClientResponseArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
|
|
targetClientResponseArbiter = (select responseArbiterByClient clientTag)
|
|
|
|
arbiterClientSlot :: Arbiter.ArbiterClient_IFC
|
|
arbiterClientSlot = (select targetClientResponseArbiter.clients serverIdx)
|
|
arbiterClientSlot.request
|
|
|
|
addRules |> foldr (<+>) (rules {}) clientRules
|
|
addRules |> foldr (<+>) (rules {}) serverRules
|
|
|
|
-- Client interface vector
|
|
let clients :: Vector numClients (BusClient inFlightTransactions)
|
|
clients = genWith $ \clientIdx ->
|
|
let
|
|
selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
|
|
selectedClientRequestQueue = (select clientRequestQueues clientIdx)
|
|
|
|
selectedClientResponseQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
|
|
selectedClientResponseQueue = (select clientResponseQueues clientIdx)
|
|
|
|
selectedTagEngine :: TagEngine inFlightTransactions
|
|
selectedTagEngine = (select tagEngineByClientVec clientIdx)
|
|
in
|
|
interface BusClient
|
|
submitRequest :: BusRequest
|
|
-> ActionValue (MkTagType inFlightTransactions)
|
|
submitRequest busRequest = do
|
|
tag <- selectedTagEngine.requestTag
|
|
let taggedReuqest = TaggedBusRequest {tag = tag; busRequest = busRequest}
|
|
selectedClientRequestQueue.enq taggedReuqest
|
|
return tag
|
|
|
|
consumeResponse :: ActionValue (TaggedBusResponse inFlightTransactions)
|
|
consumeResponse = do
|
|
let
|
|
busResponse :: (TaggedBusResponse inFlightTransactions)
|
|
busResponse = selectedClientResponseQueue.first
|
|
selectedTagEngine.retireTag busResponse.tag
|
|
selectedClientResponseQueue.deq
|
|
return busResponse
|
|
|
|
-- Server interface vector
|
|
let servers :: Vector numServers (BusServer inFlightTransactions numClients)
|
|
servers = genWith $ \serverIdx ->
|
|
let
|
|
selectedConsumeRequestQueue :: FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusRequest inFlightTransactions
|
|
)
|
|
selectedConsumeRequestQueue = (select consumeRequestQueues serverIdx)
|
|
in
|
|
interface BusServer
|
|
consumeRequest :: ActionValue (
|
|
MkClientTagType numClients,
|
|
TaggedBusRequest inFlightTransactions
|
|
)
|
|
consumeRequest = do
|
|
selectedConsumeRequestQueue.deq
|
|
return selectedConsumeRequestQueue.first
|
|
|
|
submitResponse :: ( MkClientTagType numClients,
|
|
TaggedBusResponse inFlightTransactions
|
|
) -> Action
|
|
submitResponse (clientTag, taggedBusResponse) = do
|
|
let
|
|
selectedSubmitResponseQueue :: FIFOF (
|
|
MkClientTagType numClients,
|
|
TaggedBusResponse inFlightTransactions
|
|
)
|
|
selectedSubmitResponseQueue = (select submitResponseQueues serverIdx)
|
|
selectedSubmitResponseQueue.enq (clientTag, taggedBusResponse)
|
|
|
|
return $
|
|
interface Bus
|
|
clients = clients
|
|
servers = servers
|