ruby: included ruby config parameter ports per core

Slightly improved the major hack need to correctly assign the number of ports
per core.  CPUs have two ports: icache + dcache.  MemTester has one port.

configs/example/memtest-ruby.py

@@ -86,8 +86,11 @@ cpus = [ MemTest(atomic=options.atomic, max_loads=options.maxloads, \
          for i in xrange(options.testers) ]
 
 # create the desired simulated system
-# ruby memory
+# ruby memory must be at least 16 MB to work with the mem tester
-ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", options.testers)
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb",
+                                   cores = options.testers,
+                                   memory_size = 16,
+                                   ports_per_cpu = 1)
 
 system = System(cpu = cpus, funcmem = PhysicalMemory(),
                 physmem = ruby_memory)

src/mem/RubyMemory.py

@@ -45,3 +45,4 @@ class RubyMemory(PhysicalMemory):
     num_dmas = Param.Int(0, "Number of DMA ports connected to the Ruby memory")
     dma_port = VectorPort("Ruby_dma_ports")
     pio_port = Port("Ruby_pio_port")
+    ports_per_core = Param.Int(2, "Number of per core. Typical two: icache + dcache")

src/mem/rubymem.cc

@@ -58,6 +58,8 @@ RubyMemory::RubyMemory(const Params *p)
     ruby_clock = p->clock;
     ruby_phase = p->phase;
 
+    ports_per_cpu = p->ports_per_core;
+
     DPRINTF(Ruby, "creating Ruby Memory from file %s\n",
             p->config_file.c_str());
 
@@ -230,14 +232,14 @@ RubyMemory::getPort(const std::string &if_name, int idx)
 
     //
     // Currently this code assumes that each cpu has both a
-    // icache and dcache port and therefore divides by two.  This will be
+    // icache and dcache port and therefore divides by ports per cpu.  This will
-    // fixed once we unify the configuration systems and Ruby sequencers
+    // be fixed once we unify the configuration systems and Ruby sequencers
     // directly support M5 ports.
     //
-    assert(idx/2 < ruby_ports.size());
+    assert(idx/ports_per_cpu < ruby_ports.size());
     Port *port = new Port(csprintf("%s-port%d", name(), idx), 
                           this, 
-                          ruby_ports[idx/2]);
+                          ruby_ports[idx/ports_per_cpu]);
 
     ports[idx] = port;
     return port;

src/mem/rubymem.hh

@@ -130,6 +130,7 @@ class RubyMemory : public PhysicalMemory
     Tick ruby_clock;
     Tick ruby_phase;
     RubyExitCallback* rubyExitCB;
+    int ports_per_cpu;
 
   public:
     static std::map<int64_t, PacketPtr> pending_requests;

tests/configs/ruby_config.py

@@ -8,7 +8,7 @@ from m5.params import *
 
 def generate(config_file, cores=1, memories=1, memory_size=1024, \
              cache_size=32768, cache_assoc=8, dmas=1,
-             ruby_tick='1t'):
+             ruby_tick='1t', ports_per_cpu=2):
     default = joinpath(dirname(__file__), '../../src/mem/ruby/config')
     ruby_config = os.environ.get('RUBY_CONFIG', default)
     args = [ "ruby", "-I", ruby_config, joinpath(ruby_config, "print_cfg.rb"),
@@ -25,4 +25,5 @@ def generate(config_file, cores=1, memories=1, memory_size=1024, \
                                  config_file = temp_config,
                                  num_cpus = cores,
                                  range = AddrRange(str(memory_size)+"MB"),
-                                 num_dmas = dmas)
+                                 num_dmas = dmas,
+                                 ports_per_core = ports_per_cpu)