mem: Set the cache line size on a system level

This patch removes the notion of a peer block size and instead sets
the cache line size on the system level.

Previously the size was set per cache, and communicated through the
interconnect. There were plenty checks to ensure that everyone had the
same size specified, and these checks are now removed. Another benefit
that is not yet harnessed is that the cache line size is now known at
construction time, rather than after the port binding. Hence, the
block size can be locally stored and does not have to be queried every
time it is used.

A follow-on patch updates the configuration scripts accordingly.

1 files changed, 1 insertions, 31 deletions

diff --git a/src/mem/bus.cc b/src/mem/bus.cc
index d94bd6a28..5ab7e5b04 100644
--- a/src/mem/bus.cc
+++ b/src/mem/bus.cc
@@ -60,8 +60,7 @@ BaseBus::BaseBus(const BaseBusParams *p)
       gotAddrRanges(p->port_default_connection_count +
                           p->port_master_connection_count, false),
       gotAllAddrRanges(false), defaultPortID(InvalidPortID),
-      useDefaultRange(p->use_default_range),
-      blockSize(p->block_size)
+      useDefaultRange(p->use_default_range)
 {}
 
 BaseBus::~BaseBus()
@@ -80,29 +79,6 @@ BaseBus::~BaseBus()
 void
 BaseBus::init()
 {
-    // determine the maximum peer block size, look at both the
-    // connected master and slave modules
-    uint32_t peer_block_size = 0;
-
-    for (MasterPortConstIter m = masterPorts.begin(); m != masterPorts.end();
-         ++m) {
-        peer_block_size = std::max((*m)->peerBlockSize(), peer_block_size);
-    }
-
-    for (SlavePortConstIter s = slavePorts.begin(); s != slavePorts.end();
-         ++s) {
-        peer_block_size = std::max((*s)->peerBlockSize(), peer_block_size);
-    }
-
-    // if the peers do not have a block size, use the default value
-    // set through the bus parameters
-    if (peer_block_size != 0)
-        blockSize = peer_block_size;
-
-    // check if the block size is a value known to work
-    if (!(blockSize == 16 || blockSize == 32 || blockSize == 64 ||
-          blockSize == 128))
-        warn_once("Block size is neither 16, 32, 64 or 128 bytes.\n");
 }
 
 BaseMasterPort &
@@ -559,12 +535,6 @@ BaseBus::getAddrRanges() const
     return busRanges;
 }
 
-unsigned
-BaseBus::deviceBlockSize() const
-{
-    return blockSize;
-}
-
 void
 BaseBus::regStats()
 {