dev-amdgpu: Add initial AMDGPU device

The initial device contains enough code for the gpufs configuration
scripts to register an amdgpu device that identifies as a Vega 10
(Frontier Edition) device when PCI devices are listed by Linux. It also
contains stubs necessary for adding the MMIO interface to handle driver
initialization.

Using the configuration Linux boots and the device is successfully seen
in lspci. The driver can also begin loading an successfully sends
initial MMIOs and attempts to read the ROM.

Change-Id: I7ad87026876f31f44668e700d5adb639c2c053c1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44909
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/dev/amdgpu/SConscript

@@ -0,0 +1,42 @@
+# 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.
+
+Import('*')
+
+if env['TARGET_ISA'] != 'x86' or not env['BUILD_GPU']:
+    Return()
+
+# Controllers
+SimObject('AMDGPU.py')
+
+Source('amdgpu_device.cc')
+
+DebugFlag('AMDGPUDevice')