Swapnil Haria has uploaded this change for review. (
https://gem5-review.googlesource.com/5589
Change subject: mem-ruby: Support atomic_noncaching acceses in ruby
......................................................................
mem-ruby: Support atomic_noncaching acceses in ruby
Ruby has no support for atomic_noncaching accesses, which prevents using
it with kvm-cpu. This patch fixes this by directly forwarding atomic
requests from the ruby port/sequencer to the corresponding directory
based on the destination address of the packet.
Change-Id: I0df4e64bcaf8f0be94501cac5d5c086663c66d25
---
M src/mem/ruby/slicc_interface/AbstractController.cc
M src/mem/ruby/slicc_interface/AbstractController.hh
M src/mem/ruby/system/RubyPort.cc
M src/mem/ruby/system/RubyPort.hh
4 files changed, 71 insertions(+), 4 deletions(-)
diff --git a/src/mem/ruby/slicc_interface/AbstractController.cc
b/src/mem/ruby/slicc_interface/AbstractController.cc
index 0bc88ee..8429155 100644
--- a/src/mem/ruby/slicc_interface/AbstractController.cc
+++ b/src/mem/ruby/slicc_interface/AbstractController.cc
@@ -360,6 +360,11 @@
delete pkt;
}
+Tick
+AbstractController::recvAtomic(PacketPtr pkt) {
+ return ticksToCycles(memoryPort.sendAtomic(pkt));
+}
+
MachineID
AbstractController::mapAddressToMachine(Addr addr, MachineType mtype) const
{
diff --git a/src/mem/ruby/slicc_interface/AbstractController.hh
b/src/mem/ruby/slicc_interface/AbstractController.hh
index 354dc80..35cd3d2 100644
--- a/src/mem/ruby/slicc_interface/AbstractController.hh
+++ b/src/mem/ruby/slicc_interface/AbstractController.hh
@@ -135,6 +135,7 @@
void queueMemoryWritePartial(const MachineID &id, Addr addr, Cycles
latency,
const DataBlock &block, int size);
void recvTimingResp(PacketPtr pkt);
+ Tick recvAtomic(PacketPtr pkt);
const AddrRangeList &getAddrRanges() const { return addrRanges; }
diff --git a/src/mem/ruby/system/RubyPort.cc
b/src/mem/ruby/system/RubyPort.cc
index 5b94f80..55c4f66 100644
--- a/src/mem/ruby/system/RubyPort.cc
+++ b/src/mem/ruby/system/RubyPort.cc
@@ -226,6 +226,29 @@
panic("Should never reach here!\n");
}
+Tick
+RubyPort::PioSlavePort::recvAtomic(PacketPtr pkt)
+{
+ RubyPort *ruby_port = static_cast<RubyPort *>(&owner);
+ // Only atomic_noncaching mode supported!
+ if (!ruby_port->system->bypassCaches()) {
+ panic("Ruby supports atomic accesses only in noncaching mode\n");
+ }
+
+ for (size_t i = 0; i < ruby_port->master_ports.size(); ++i) {
+ AddrRangeList l = ruby_port->master_ports[i]->getAddrRanges();
+ for (auto it = l.begin(); it != l.end(); ++it) {
+ if (it->contains(pkt->getAddr())) {
+ // generally it is not safe to assume success here as
+ // the port could be blocked
+ return ruby_port->ticksToCycles(
+ ruby_port->master_ports[i]->sendAtomic(pkt));
+ }
+ }
+ }
+ panic("Should never reach here!\n");
+}
+
bool
RubyPort::MemSlavePort::recvTimingReq(PacketPtr pkt)
{
@@ -287,6 +310,45 @@
return false;
}
+Tick
+RubyPort::MemSlavePort::recvAtomic(PacketPtr pkt)
+{
+ RubyPort *ruby_port = static_cast<RubyPort *>(&owner);
+ // Only atomic_noncaching mode supported!
+ if (!ruby_port->system->bypassCaches()) {
+ panic("Ruby supports atomic accesses only in noncaching mode\n");
+ }
+
+ // Check for pio requests and directly send them to the dedicated
+ // pio port.
+ if (pkt->cmd != MemCmd::MemFenceReq) {
+ if (!isPhysMemAddress(pkt->getAddr())) {
+ assert(ruby_port->memMasterPort.isConnected());
+ DPRINTF(RubyPort, "Request address %#x assumed to be a "
+ "pio address\n", pkt->getAddr());
+
+ // Save the port in the sender state object to be used later to
+ // route the response
+ pkt->pushSenderState(new SenderState(this));
+
+ // send next cycle
+ Tick req_ticks = ruby_port->memMasterPort.sendAtomic(pkt);
+ return ruby_port->ticksToCycles(req_ticks);
+ }
+
+ assert(getOffset(pkt->getAddr()) + pkt->getSize() <=
+ RubySystem::getBlockSizeBytes());
+ }
+
+ // Find appropriate directory for address
+ MachineID id = ruby_port->m_controller->mapAddressToMachine(
+ pkt->getAddr(), MachineType_Directory);
+ RubySystem *rs = ruby_port->m_ruby_system;
+ AbstractController *directory =
+ rs->m_abstract_controls[id.getType()][id.getNum()];
+ return directory->recvAtomic(pkt);
+}
+
void
RubyPort::MemSlavePort::addToRetryList()
{
diff --git a/src/mem/ruby/system/RubyPort.hh
b/src/mem/ruby/system/RubyPort.hh
index 6c991c1..1464432 100644
--- a/src/mem/ruby/system/RubyPort.hh
+++ b/src/mem/ruby/system/RubyPort.hh
@@ -46,6 +46,7 @@
#include <string>
#include "mem/protocol/RequestStatus.hh"
+#include "mem/ruby/common/MachineID.hh"
#include "mem/ruby/network/MessageBuffer.hh"
#include "mem/ruby/system/RubySystem.hh"
#include "mem/mem_object.hh"
@@ -88,8 +89,7 @@
protected:
bool recvTimingReq(PacketPtr pkt);
- Tick recvAtomic(PacketPtr pkt)
- { panic("RubyPort::MemSlavePort::recvAtomic() not
implemented!\n"); }
+ Tick recvAtomic(PacketPtr pkt);
void recvFunctional(PacketPtr pkt);
@@ -127,8 +127,7 @@
protected:
bool recvTimingReq(PacketPtr pkt);
- Tick recvAtomic(PacketPtr pkt)
- { panic("recvAtomic not supported with ruby!"); }
+ Tick recvAtomic(PacketPtr pkt);
void recvFunctional(PacketPtr pkt)
{ panic("recvFunctional should never be called on pio slave
port!"); }
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I0df4e64bcaf8f0be94501cac5d5c086663c66d25
Gerrit-Change-Number: 5589
Gerrit-PatchSet: 1
Gerrit-Owner: Swapnil Haria <[email protected]>
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