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configs: model the GPU scalar cache separately from the SQC #3

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configs: model the GPU scalar cache separately from the SQC #3

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a74b4dc
configs: model the GPU scalar cache separately from the SQC
Basemism Sep 2, 2026
e65ae7f
Refactor ScalarCache class and update options handling
Basemism Sep 11, 2026
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50 changes: 49 additions & 1 deletion configs/ruby/GPU_VIPER.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,48 @@ def create(self, options, ruby_system, system):
self.recycle_latency = options.recycle_latency


class ScalarCache(SQCCache):
def create(self, options):
self.size = MemorySize(options.scalar_size)
self.assoc = options.scalar_assoc
if hasattr(options, "scalar_rp"):
self.replacement_policy = ObjectList.rp_list.get(
options.scalar_rp
)()
elif hasattr(options, "sqc_rp"):
self.replacement_policy = ObjectList.rp_list.get(options.sqc_rp)()

class ScalarCntrl(GPU_VIPER_SQC_Controller, CntrlBase):
def create(self, options, ruby_system, system):
# Scalar and SQC controllers share MachineType:SQC, so their
# controller version IDs must come from the same counter.
self.version = SQCCntrl.versionCount()

self.L1cache = ScalarCache()
self.L1cache.create(options)
self.L1cache.resourceStalls = options.no_resource_stalls

self.sequencer = VIPERSequencer()

self.sequencer.version = self.seqCount()
self.sequencer.dcache = self.L1cache
self.sequencer.ruby_system = ruby_system
self.sequencer.support_data_reqs = False
self.sequencer.is_cpu_sequencer = False
if options.sqc_deadlock_threshold:
self.sequencer.deadlock_threshold = options.sqc_deadlock_threshold

self.ruby_system = ruby_system
if hasattr(options, "gpu_clock") and hasattr(options, "gpu_voltage"):
self.clk_domain = SrcClockDomain(
clock=options.gpu_clock,
voltage_domain=VoltageDomain(voltage=options.gpu_voltage),
)

if options.recycle_latency:
self.recycle_latency = options.recycle_latency


class TCC(RubyCache):
size = MemorySize("256KiB")
assoc = 16
Expand Down Expand Up @@ -452,6 +494,12 @@ def define_options(parser):
parser.add_argument(
"--sqc-assoc", type=int, default=8, help="SQC cache assoc"
)
parser.add_argument(
"--scalar-size", type=str, default="32KiB", help="Scalar cache size"
)
parser.add_argument(
"--scalar-assoc", type=int, default=8, help="Scalar cache assoc"
)
parser.add_argument(
"--sqc-deadlock-threshold",
type=int,
Expand Down Expand Up @@ -872,7 +920,7 @@ def construct_scalars(options, system, ruby_system, network):
TCC_bits = int(math.log(options.num_tccs, 2))

for i in range(options.num_scalar_cache):
scalar_cntrl = SQCCntrl(TCC_select_num_bits=TCC_bits)
scalar_cntrl = ScalarCntrl(TCC_select_num_bits=TCC_bits)
scalar_cntrl.create(options, ruby_system, system)

exec("ruby_system.scalar_cntrl%d = scalar_cntrl" % i)
Expand Down