riscv/rocket-chip
1
0
Fork 0
Code Releases Activity

Refactor L2 transaction trackers to each be capable of processing Voluntary Writebacks.

Browse Source 
To elide several races between reading and writing the metadata array for different types of transactions, all L2XactTrackers can now sink Voluntary Releases (writebacks from the L1 in the current implementation). These writebacks are merged with the ongoing transaction, and the merging tracker supplies an acknowledgment of the writeback in addition to its ongoing activities. This change involved another refactoring of the control logic for allocating new trackers and routing incoming Acquires and Releases. BroadcastHub uses the new routing logic, but still processes all voluntary releases through the VoluntaryReleaseTracker (not a problem because there are no metadata update races).

Closes #18
Closes #20
This commit is contained in:
Henry Cook
2016-03-06 23:12:16 -08:00
parent 36f2e6504c
commit 93773a4496
6 changed files with 319 additions and 147 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
uncore/src/main/scala/converters.scala
View File

@ -199,6 +199,7 @@ object ManagerTileLinkHeaderCreator {
*/
trait HasDataBeatCounters {
type HasBeat = TileLinkChannel with HasTileLinkBeatId
type HasId = TileLinkChannel with HasClientId
/** Returns the current count on this channel and when a message is done
* @param inc increment the counter (usually .valid or .fire())
@ -259,11 +260,12 @@ trait HasDataBeatCounters {
up: DecoupledIO[T],
down: DecoupledIO[S],
beat: UInt = UInt(0),
track: T => Bool = (t: T) => Bool(true)): (Bool, UInt, Bool, UInt, Bool) = {
trackUp: T => Bool = (t: T) => Bool(true),
trackDown: S => Bool = (s: S) => Bool(true)): (Bool, UInt, Bool, UInt, Bool) = {
val (up_idx, up_done) = connectDataBeatCounter(up.fire(), up.bits, beat)
val (down_idx, down_done) = connectDataBeatCounter(down.fire(), down.bits, beat)
val do_inc = up_done && track(up.bits)
val do_dec = down_done
val do_inc = up_done && trackUp(up.bits)
val do_dec = down_done && trackDown(down.bits)
val cnt = TwoWayCounter(do_inc, do_dec, max)
(cnt > UInt(0), up_idx, up_done, down_idx, down_done)
}