Matthew Poremba has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/51851 )
Change subject: dev-amdgpu: Add SystemHub for GPU load/store to host
......................................................................
dev-amdgpu: Add SystemHub for GPU load/store to host
In a dGPU configuration, vector and scalar loads/stores can either be
requests to device memory or host memory depending on if the system bit
is set in the PTE when the request's virtual address is translated. This
object is used to send/receive those requests to the host via DMA.
Change-Id: I4537059f90ebc03f3b2e6b8b631b4c452841f83f
---
M src/dev/amdgpu/SConscript
A src/dev/amdgpu/system_hub.cc
A src/dev/amdgpu/system_hub.hh
M src/dev/amdgpu/AMDGPU.py
4 files changed, 181 insertions(+), 0 deletions(-)
diff --git a/src/dev/amdgpu/AMDGPU.py b/src/dev/amdgpu/AMDGPU.py
index d1099e6..131e842 100644
--- a/src/dev/amdgpu/AMDGPU.py
+++ b/src/dev/amdgpu/AMDGPU.py
@@ -94,3 +94,8 @@
type = 'AMDGPUInterruptHandler'
cxx_header = "dev/amdgpu/interrupt_handler.hh"
cxx_class = 'gem5::AMDGPUInterruptHandler'
+
+class AMDGPUSystemHub(DmaDevice):
+ type = 'AMDGPUSystemHub'
+ cxx_class = 'gem5::AMDGPUSystemHub'
+ cxx_header = "dev/amdgpu/system_hub.hh"
diff --git a/src/dev/amdgpu/SConscript b/src/dev/amdgpu/SConscript
index 17c787f..c141a54 100644
--- a/src/dev/amdgpu/SConscript
+++ b/src/dev/amdgpu/SConscript
@@ -41,6 +41,7 @@
Source('interrupt_handler.cc', tags='x86 isa')
Source('memory_manager.cc', tags='x86 isa')
Source('mmio_reader.cc', tags='x86 isa')
+Source('system_hub.cc')
DebugFlag('AMDGPUDevice', tags='x86 isa')
DebugFlag('AMDGPUMem', tags='x86 isa')
diff --git a/src/dev/amdgpu/system_hub.cc b/src/dev/amdgpu/system_hub.cc
new file mode 100644
index 0000000..17688a4
--- /dev/null
+++ b/src/dev/amdgpu/system_hub.cc
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021 Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * For use for simulation and test purposes only
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
notice,
+ * this list of conditions and the following disclaimer in the
documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "dev/amdgpu/system_hub.hh"
+
+#include "mem/port.hh"
+
+namespace gem5
+{
+
+void
+AMDGPUSystemHub::sendRequest(PacketPtr pkt, Event *callback)
+{
+ ResponseEvent *dmaRespEvent = new ResponseEvent(pkt, callback);
+ Tick delay = 0;
+
+ // Assuming read XOR write (i.e., not an atomic).
+ assert(pkt->isRead() ^ pkt->isWrite());
+
+ if (pkt->isRead()) {
+ dmaRead(pkt->getAddr(), pkt->getSize(), dmaRespEvent,
+ pkt->getPtr<uint8_t>(), 0, 0, delay);
+ } else {
+ dmaWrite(pkt->getAddr(), pkt->getSize(), dmaRespEvent,
+ pkt->getPtr<uint8_t>(), 0, 0, delay);
+ }
+}
+
+void
+AMDGPUSystemHub::dmaResponse(PacketPtr pkt)
+{
+}
+
+AMDGPUSystemHub::ResponseEvent::ResponseEvent(PacketPtr pkt, Event
*_callback)
+ : reqPkt(pkt), callback(_callback)
+{
+ // Delete this event after process is called
+ setFlags(Event::AutoDelete);
+}
+
+void
+AMDGPUSystemHub::ResponseEvent::process()
+{
+ callback->process();
+}
+
+AddrRangeList
+AMDGPUSystemHub::getAddrRanges() const
+{
+ AddrRangeList ranges;
+ return ranges;
+}
+
+} // namespace gem5
diff --git a/src/dev/amdgpu/system_hub.hh b/src/dev/amdgpu/system_hub.hh
new file mode 100644
index 0000000..f20a6a1
--- /dev/null
+++ b/src/dev/amdgpu/system_hub.hh
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2021 Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * For use for simulation and test purposes only
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
notice,
+ * this list of conditions and the following disclaimer in the
documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __DEV_GPU_SYSTEM_HUB_HH__
+#define __DEV_GPU_SYSTEM_HUB_HH__
+
+#include "dev/dma_device.hh"
+#include "params/AMDGPUSystemHub.hh"
+
+namespace gem5
+{
+
+class RequestPort;
+
+class AMDGPUSystemHub : public DmaDevice
+{
+ public:
+ AMDGPUSystemHub(const AMDGPUSystemHubParams &p) : DmaDevice(p) { }
+
+ void sendRequest(PacketPtr pkt, Event *callback);
+ void dmaResponse(PacketPtr pkt);
+
+ /**
+ * Inherited methods.
+ */
+ Tick write(PacketPtr pkt) override { return 0; }
+ Tick read(PacketPtr pkt) override { return 0; }
+ AddrRangeList getAddrRanges() const override;
+
+ private:
+
+ class ResponseEvent : public Event
+ {
+ PacketPtr reqPkt;
+ Event *callback;
+
+ public:
+ ResponseEvent(PacketPtr pkt, Event *_callback);
+
+ void process();
+
+ };
+};
+
+} // namespace gem5
+
+#endif /* __DEV_GPU_SYSTEM_HUB_HH__ */
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I4537059f90ebc03f3b2e6b8b631b4c452841f83f
Gerrit-Change-Number: 51851
Gerrit-PatchSet: 1
Gerrit-Owner: Matthew Poremba <matthew.pore...@amd.com>
Gerrit-MessageType: newchange
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