Release of MI300X simulation capability:
- Implements the required MI300X features over MI200 (currently only
architecture flat scratch).
- Make the gpu-compute model use MI200 features when MI300X / gfx942 is
configured.
- Fix up the scratch_ instructions which are seem to be preferred in
debug hipcc builds over buffer_.
- Add mi300.py config similar to mi200.py. This config can optionally
use resources instead of command line args.
It appears we have been trying to read 64-bit arguments for ARM32 since
695583709b. I noticed that SYS_OPEN was
trying to read a really long string as the pathname argument and it
turned out it was reading from the wrong stack offset. With this change
I can successfully run some of the semihosting tests for ARM32.
Change-Id: Ie154052dac4211993fb6c4c99d93990123c2eacf
In BaseSemihosting::readString() we were using the len argument to
allocate a std::vector without checking whether the value makes any
sense. This resulted in a std::bad_alloc exception being raised prior to
https://github.com/gem5/gem5/pull/1142 for my semihosting tests. This
commit prevents semihosting from reading more than 64K for string
arguments which should be more than sufficient for any valid code.
Change-Id: I059669016ee2c5721fedb914595d0494f6cfd4cd
This commit fixes the implementation of vrgather instruction based on
rvv 1.0.
In section 16.4. Vector Register Gather Instructions,
> Vector-scalar and vector-immediate forms of the register gather are
also provided. These read one element from the source vector at the
given index, and write this value to the active elements of the
destination vector register. The index value in the scalar register and
the immediate, zero-extended to XLEN bits, are treated as unsigned
integers. If XLEN > SEW, the index value is not truncated to SEW bits.
The fix zero-extends the index value in the scalar register and the
immediate.
Add a config capable of simulating MI300X ISA (gfx942). This is similar
to the mi200.py config and uses the same scripts followed by some
tuneable parameters. This config optionally lets the user call the
runMI300GPU function with gem5 resources. This allows for something like
the following before a VIPER stdlib python is available:
```
import mi300
from gem5.resources.resource import obtain_resource
disk = obtain_resource("x86-gpu-fs-img")
kernel = obtain_resource("x86-linux-kernel-5.4.0-105-generic")
app = obtain_resource("square-gpu-test")
mi300.runMI300GPUFS("X86KvmCPU", disk, kernel, app)
```
Tested cold boot config, checkpoint create and restore, and using gem5
resources.
Change-Id: I50a13d7a3d207786b779bf7fd47a5645256b1e6a
Architected flat scratch is added in MI300 which store the scratch base
address in dedicated registers rather than in SGPRs. These registers are
used by scratch_ instructions. These are flat instruction which
explicitly target the private memory aperture. These instructions have a
different address calculation than global_ instructions.
This change implements architected flat scratch support, fixes the
address calculation of scratch_ instructions, and implements decodings
for some scratch_ instructions. Previous flat_ instructions which happen
to access the private memory aperture have no change in address
calculation. Since scratch_ instructions are identical to flat_
instruction except for address calculation, the decodings simply reuse
existing flat_ instruction definitions.
Change-Id: I1e1d15a2fbcc7a4a678157c35608f4f22b359e21
Add support for the following two extensions:
[Zvfh](https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#185-zvfh-vector-extension-for-half-precision-floating-point):
Vector Extension for Half-Precision Floating-Point
[Zvfhmin](https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#184-zvfhmin-vector-extension-for-minimal-half-precision-floating-point):
Vector Extension for Minimal Half-Precision Floating-Point
For instructions (`vfncvt[.rtz].x[u].f.w`) and (`vfwcvt.f.x[u].v`) which
will become defined when `SEW = 8`, a new template
`VectorFloatWideningAndNarrowingCvtDecodeBlock` is added and 8-bit
floating point type (`float8_t`) is defined.
The data type `float8_t` is introduced in the newer `3e` version of the
SoftFloat Package, however, the current version in use is `3d` which
does not include this definition. Despite this, `float8_t` is utilized
solely for constructing the `vfncvt[.rtz].x[u].f.w` and
`vfwcvt.f.x[u].v` instructions when `SEW = 8`. There are no operations
that directly manipulate data of the `float8_t` type.
This is the version for MI300. For the most part, it is the same as
MI200 with the exception of architected flat scratch (not yet
implemented in gem5) and therefore a new version enum is required.
Change-Id: Id18cd7b57c4eebd467c010a3f61e3117beb8d58a
- Adding this line as not specifiying GNU non executable stack was
throwing warnings when building m5
for ubuntu 24.04
Change-Id: I620c508be4090804698391cff671ba5091b053d7
These changes to sweep and sweep_hybrid for NVM allow them to run. I'm
not an expert on this, so I'm not sure if these are technically correct,
but they no longer fail when running
`build/X86/gem5.opt configs/nvm/sweep.py` and `build/X86/gem5.opt
configs/nvm/sweep_hybrid.py`
GitHub Issue: #669
The SIMPOINT_BEGIN should do nothing by default since it might be used
in various cases.
In
[https://www.mail-archive.com/gem5-users@gem5.org/msg22383.html](mailing
list), a user discovered a bug with the current
`simpoints-se-restore.py` example.
The bug is caused by the default behavior of the SIMPOINT_BEGIN exit
event.
When taking a checkpoint with `simpoints-se-checkpoint.py`, it stores
the future exit event scheduled at the beginning of the simulation. I
did not notice this when I wrote and tested the example script due to
the long print out log and my custom handler of the SIMPOINT_BEGIN exit
event.
In the restoring, the SIMPOINT_BEGIN exit event was triggered right
before the region end, so it resets the stats before the final stats
dump. Therefore, the simulation time is 0 as the user discovered.
This patch should fix this bug.
Change-Id: I800dfbd28d7b2c842864a1ab7d84b8f8e17b9b3c
This PR implements FEAT_MPAM on the CPU side. We define a MPAM system
registers and a mechanism
for tagging memory requests with the MPAM information bundle as
specified in existing documentation [1].
What this PR is *not* covering is the MPAM implementation in a MSC
(Memory System Component).
Which means at the moment it's only possible to have static partitioning
schemes (via the PartitioningPolicies
already part of gem5) and there is currently no way to dynamically
program partitions at runtime.
[1]: https://developer.arm.com/documentation/ddi0487/latest/
Quote from change[1]
> The RISC-V spec clarifies the CSR instruction operation, some of them
shall not read or write CSR by the hints of RD/RS1/uimm, but the
original version use the 'data != oldData' condition to determine
whether write or not, and always read CSR first.
See CSR instruction in spec:
Section 9.1 Page 56 of
https://github.com/riscv/riscv-isa-manual/releases/download/Ratified-IMAFDQC/riscv-spec-20191213.pdf
|||Register operand|||
|--- |--- |--- |--- |--- |
|Instruction|rd is x0|rs1 is x0|Reads CSR|Writes CSR|
|CSRRW|Yes|-|No|Yes|
|CSRRW|No|-|Yes|Yes|
|CSRRS/CSRRC|-|Yes|Yes|No|
|CSRRS/CSRRC|-|No|Yes|Yes|
|||Immediate operand|||
|Instruction|rd is x0|uimm = 0|Reads CSR|Writes
CSR|
|CSRRWI|Yes|-|No|Yes|
|CSRRWI|No|-|Yes|Yes|
|CSRRSI/CSRRCI|-|Yes|Yes|No|
|CSRRSI/CSRRCI|-|No|Yes|Yes|
The issue cause the ubuntu hanging because we shared the same status CSR
with `mstatus`, `sstatus` and `ustatus` and interrupt enabling CSR with
mip, sip and uip. We may need to read origin CSR without effect of
unmask bits to avoid override the bits of other CSR. Now the ubuntu can
work after the patch merged.
[1] https://gem5-review.googlesource.com/c/public/gem5/+/67717
The destination select should take a value of the selection size (dword,
word, or byte) starting at bit 0, move that to the selected destination,
and then apply the unused constraint (DST_U) to the remaining word or
bytes. Currently the code is selecting the word/byte currently being
iterated over, rather than the least significant word/byte. As a result,
any selection that is not word 0 or byte 0 will be replaced with the
original destination value at those bits. This results in the wrong
value.
This commit changes the orig bits to be the original dest value at the
lowest word / byte location. Tested with the mfma_i32_16x16x16i8 example
which uses an SDWA V_OR_B32 to pack i8 values into VGPRs for the MFMA.
Change-Id: I54ed819479a25fa9276d29a8f14f0fea7fd71afe
This PR includes a check for `m_pkt` being null and appropriately
handles that case. This issue was causing the Daily tests to fail.
Change-Id: I87142ca14ca4ab3d8306153a1cf34c2629a119ba
This patch is adding the NS bit to CHI requests to make sure they are
properly tagged according to their security
Change-Id: I33d3610edefbb5a05a6090e9125c35d4fb8bca58
Reviewed-by: Tiago Muck <tiago.muck@arm.com>
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
The extended control registers were not being updated in the KVM thread
context nor updated in the KVM state. This was causing issues when
checkpointing since the XCR0 value was reverting to the default value
rather than what it was previously before the checkpoint. THis was
causing multiple applications to crash due to executing instructions
which are now illegal instructions due to XCR0 being incorrect.
This commit adds the XCR0 as a misc register similar to the exiting x86
control registers and adds all of the helper functions to access and set
the register value. It also adds support for updating the KVM CPU's
state with the register value and updating the thread context's misc reg
value so that it is checkpointed along with the other misc regs.
Note that this does *not* add support for XSAVE of the AVX state (i.e.,
the upper 128 bits of YMM registers). It does however fix the immediate
problem in issue #958 .
Change-Id: I97456c8b57cbc7b381bd4be94944ce6567a43c76
Includes fixes for several bugs reported via email, self found, and
internal reports. Also includes runs through Valgrind and UBsan. See
individual commits for more details.
The scalar cache is not being invalidated which causes stale data to be
left in the scalar cache between GPU kernels. This commit sends
invalidates to the scalar cache when the SQC is invalidated. This is a
sufficient baseline for simulation.
Since the number of invalidates might be larger than the mandatory queue
can hold and no flash invalidate mechanism exists in the VIPER protocol,
the command line option for the mandatory queue size is removed, which
is the same behavior as the SQC.
Change-Id: I1723f224711b04caa4c88beccfa8fb73ccf56572
The implementation of SYS_FLEN was missing, which caused picolibc to
treat this file as not implemented. Additionally, there was a bug in the
SYS_READ call that was comparing the wrong variable against the passed
buffer length. It was comparing the current file position against the
buffer length instead of the number of written bytes. Finally, pos was
unititialized which could result in spurious errors.
Change-Id: I8b487a79df5970a5001d3fef08d5579bb4aa0dd0
This prints what values are read/written to LDS and the previous value
on write. This is useful for debugging problems with LDS instructions.
Change-Id: I30063327bec1a1a808914a018467d5d78d5d58b4
SDMA ptePde packets are generating a warning that a GART address is
missing, causing a wrong address to be clobbered by the operation.
This commit fixes this by converting the GART address when the queue is
running in privledged mode, which is the only mode allowed to use GART
addresses. This removes the warnings and writes to the correct memory
region.
Change-Id: I64acac308db2431c5996b876bf4cda704f51cf25
The VOP3 instruction encoding generally states that ABS/NEG modifiers in
the instruction encoding are only valid on floating point data types.
This is currently coded in gem5 to mean floating point *instructions*.
For untyped instructions like V_CNDMASK_B32, we don't actually know what
the data type is. We must trust that the compiler did not attempt to
apply these bits to non-FP data types.
This commit simply removes the asserts. The ABS/NEG modifiers are
therefore ignored which is consistent with the ISA documentation.
This is done on the lane manipulation instructions V_CNDMASK_B32,
V_READLINE_B32, and V_WRITELANE_B32 which are typically used to mask off
or move data between registers. Other bitwise instructions (e.g.,
V_OR_B32) keep the asserts as bitwise operations on FP types are
genernally illegal in languages like C++.
Change-Id: I478c5272ba96383a063b2828de21d60948b25c8f
Fixes several memory leaks, mostly of small and medium severity. Fixes
mismatched new/new[] and delete/delete[] calls.
Change-Id: Iedafc409389bd94e45f330bc587d6d72d1971219
The address has one too many zeros and is therefore placed in a memory
region usually used for system memory. As a result this causes failure
when trying to run a simulation with a huge amount of memory.
Change the address to be within the C000'0000h - FFFF'FFFFh X86 I/O hole
as was intended.
Change-Id: I5d03ac19ea3b2c01a8c431073c12fa1868b3df24
Three main fixes:
- Remove the initDynOperandInfo. UBSAN errors and exits due to things
not being captured properly. After a few failed attempts playing with
the capture list, just move the lambda to a new method.
- Invalid data type size for some thread mask instructions. This might
actually have caused silent bugs when the thread id was > 31.
- Alignment issues with the operands.
Change-Id: I0297e10df0f0ab9730b6f1bd132602cd36b5e7ac
From sepc
> Instructions that access a non-existent CSR are reserved. Attempts to
access a CSR without appropriate privilege level raise
illegal-instruction exceptions or, as described in Section 13.6.1,
virtual-instruction exceptions. Attempts to write a read-only register
raise illegal-instruction exceptions. A read/write register might also
contain some bits that are read-only, in which case writes to the
read-only bits are ignored.
Setting the bit not in the mask should be ignore rather than raise the
illegal exception. The unmask bits of xstatus CSR are `WPRI`, the
unmasks bits of xie are `RO`(above priv v1.12) or `WPRI`(priv v1.11 and
priv v1.10), the unmask bits of xip CSR are `RO`(above priv v1.12) or
`WPRI`(priv v1.11) or `WIRI` (priv v1.10).
Note: The workload of `riscv-ubuntu-20.04-boot` uses the priv v1.10.
More details please see the `RISC-V spec: Privileged Architecture`
v1.10:
https://github.com/riscv/riscv-isa-manual/releases/tag/riscv-priv-1.10
v1.11(20190608):
https://github.com/riscv/riscv-isa-manual/releases/tag/Ratified-IMFDQC-and-Priv-v1.11
v1.12(20211213):
https://github.com/riscv/riscv-isa-manual/releases/tag/Priv-v1.12
Change-Id: I5d6e964e99b30b71da3dc267cd1575665d922633
Currently, the filesRootDir is prepended for all paths that do not start
with '/'. However, we should not be doing this for the special files :tt
and :semihosting-features. Noticed this while testing semihosting with a
non-empty filesRootDir.
Change-Id: I156c8b680cb71cdc88788be3b0e93fc1d52e11e5
The implementation of SYS_FLEN was missing, which caused picolibc to
treat this file as not implemented. Additionally, there was a bug in
the SYS_READ call that was comparing the wrong variable against the
passed buffer length. It was comparing the current file position against
the buffer length instead of the number of written bytes.
Finally, pos was unititialized which could result in spurious errors.
Change-Id: I8b487a79df5970a5001d3fef08d5579bb4aa0dd0
This PR added RISC-V Integer Conditional Operations Extension, which is
in the RVA23U64 Profile Mandatory Base. And the performance of
conditional move instructions in micro-architecture is an interesting
point to explore.
Zicond instructions added: czero.eqz, czero.nez
Changes based on spec:
https://github.com/riscvarchive/riscv-zicond/releases/download/v1.0.1/riscv-zicond_1.0.1.pdf
As discussed in https://github.com/orgs/gem5/discussions/954:
In the refactor made by commit f65df9b959 conditional indirect
branches are no longer updated in the indirect predictor.
This kind of branches do not exist in x86 neither arm, but they are
present in PowerPC.
This patch, enables the indirect predictor to track this kind of
branches.
With this patch we are adding the specific logic required to tag memory
requests from the PE with MPAM data. This is happening within the MMU
before a translation is completed
Change-Id: Ifecb285244dd469a639150d69a7e884fe3c441be
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
