The RFC is defaulted to a size of 0 which removes it completely. To use
the RFC set the --register-file-cache-size to a non-zero multiple of
two. In addition, rfc_pipe_length may be altrered to increase or
decrease RFC latency benefit.
Change-Id: I6f5bf5b750eb64155fbc8c8343e9feadce5c9f79
The ROCm stack requires PCI express atomics. Currently the first PCI
CapabilityPtr does not point to anything, which signals to the OS
(Linux) that this is an early generation PCI device. As PCI express
atomics were introduced later, the CapabilityPtr needs to point to at
least a PCI express capability structure. This capability is defined as
0x10 in Linux. We additionally set the PCI atomic based bits and
implement device specific PCI configuration space reads and writes to
the amdgpu device.
With this commit, the output of simulation when loading the amdgpu
driver no longer outputs "PCIE atomics not supported". Further, an
application which uses PCIe atomics (PyTorch with a reduce_sum kernel)
now makes further progress.
Change-Id: I5e3866979659a2657f558941106ef65c2f4d9988
Remove the line "For use for simulation and test purposes only" in files
were AMD is the only copyright holder listed in the header. This happens
to be the case for all files where this line exists, removing it
completely from gem5.
Change-Id: I623f266b002f564301b28774f49081099cfc60fd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53943
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
The flow for Full System amdgpu is the use KVM to boot linux and begin
loading the driver module. However, the amdgpu module requires reading
the VGA ROM located at 0xc0000 in X86. KVM does not support having a
small 128KiB hole at this location, therefore we take a checkpoint and
switch to a timing CPU to continue loading the drivers before the VGA
ROM is read.
This creates a checkpoint just before the first MMIOs. This is indicated
by three interrupts being sent to the PCI device. After three interrupts
in a row are counted a checkpoint exit event occurs. The interrupt
counter is reset if a non-interrupt PCI read is seen.
Change-Id: I23b320abe81ff6e766cb3f604eca2979339938e5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46161
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This is an initial configuration capable of booting Linux and
registering a PCI device which registers as an AMD Vega 10 (Frontier
Edition) GPU. It it loosely based on the the example/fs.py and gem5 book
full system example scripts. The top-level file is meant to be modular
such that convenience scripts can be created to set arguments
automatically and then call the main run function.
This will evolve over time as more full-system GPU components are added
and the network topology needed for disjoint address spaces is created
for the VIPER protocol.
Change-Id: I7002213ca8de5eb73919e49fb11840a688744012
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44907
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>
