add support for riscv64 timer

.github/workflows/riscv64-qemu-test.yaml

@@ -0,0 +1,59 @@
+name: riscv64-qemu-test
+
+on: [pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env: 
+      riscv_gnu_toolchain_download_path: https://github.com/riscv-collab/riscv-gnu-toolchain/releases/download/2025.07.03/riscv64-glibc-ubuntu-24.04-gcc-nightly-2025.07.03-nightly.tar.xz
+
+    steps:
+    - name: Install depencencies
+      run: |
+        sudo apt update 
+        sudo apt install -y --no-install-recommends qemu-user qemu-user-static binfmt-support wget   
+        wget ${riscv_gnu_toolchain_download_path}
+        tar -xvf riscv64-glibc-ubuntu-24.04-gcc-nightly-2025.07.03-nightly.tar.xz -C /opt
+        sed -i "s|libdir='/mnt/riscv/riscv64-unknown-linux-gnu/lib'|libdir='/opt/riscv/riscv64-unknown-linux-gnu/lib'|g" /opt/riscv/riscv64-unknown-linux-gnu/lib/libatomic.la
+
+    - name: Checkout Open MPI
+      uses: actions/checkout@v4
+      with:
+       submodules: recursive
+
+    - name: Bootstrap Open MPI
+      run: |
+        ./autogen.pl
+        sed -i '/^func_exec_program_core ()/,/^}/ s/\<exec\>/exec qemu-riscv64 -cpu rv64,v=true,vext_spec=v1.0,vlen=128 -L \/opt\/riscv\/sysroot/g' config/ltmain.sh
+
+    - name: Config Open MPI
+      run: |
+        export PATH="/opt/riscv/bin:$PATH"
+        export LD_LIBRARY_PATH="/opt/riscv/lib:$LD_LIBRARY_PATH"
+        ./configure --prefix=/opt/riscv --host=riscv64-unknown-linux-gnu SYSROOT=/opt/riscv/sysroot CC=riscv64-unknown-linux-gnu-gcc LD=riscv64-unknown-linux-gnu-ld --disable-mpi-fortran --disable-sphinx LDFLAGS=-Wl,-rpath-link,/opt/riscv/lib CFLAGS="-march=rv64gcv"
+
+    - name: Build Open MPI
+      run: |  
+        export PATH="/opt/riscv/bin:$PATH"
+        export LD_LIBRARY_PATH="/opt/riscv/lib:$LD_LIBRARY_PATH"
+        sed -i 's/#define OPAL_HAVE_GCC_BUILTIN_CSWAP_INT128 1/#define OPAL_HAVE_GCC_BUILTIN_CSWAP_INT128 0/' ./opal/include/opal_config.h
+        make -j 8
+        make install
+
+    - name: Run testsuite
+      run: |
+        export PATH="/opt/riscv/bin:$PATH"
+        export LD_LIBRARY_PATH="/opt/riscv/lib:$LD_LIBRARY_PATH"
+        make check
+
+    - name: Run Opal Timer
+      run: |
+        export QEMU_LD_PREFIX=/opt/riscv/sysroot
+        export PATH="/opt/riscv/bin:$PATH"
+        export LD_LIBRARY_PATH="/opt/riscv/lib:$LD_LIBRARY_PATH"
+        mkdir -p /opt/riscv/sysroot/proc/device-tree/cpus/
+        touch  /opt/riscv/sysroot/proc/device-tree/cpus/timebase-frequency
+        grep "bogomips" /proc/cpuinfo | head -n 1 | awk '{printf("%d", $3*500000)}' | perl -e 'print pack("N", <STDIN>)' > /opt/riscv/sysroot/proc/device-tree/cpus/timebase-frequency
+        cd test/util
+        qemu-riscv64 -cpu rv64,v=true,vext_spec=v1.0,vlen=128 /opt/riscv/bin/mpirun -n 1 ./opal_timer

config/opal_config_asm.m4

@@ -538,6 +538,9 @@ AC_DEFUN([OPAL_CHECK_INLINE_C_GCC],[
             powerpc-*|powerpc64-*|powerpcle-*|powerpc64le-*|rs6000-*|ppc-*)
                 opal_gcc_inline_assign='"1: li %0,0" : "=&r"(ret)'
                 ;;
+            riscv64*)
+                opal_gcc_inline_assign='"li %0, 0" : "=&r"(ret)'
+                ;;
         esac
 
         AS_IF([test  "$opal_gcc_inline_assign" != ""],

opal/include/opal/sys/Makefile.am

@@ -42,4 +42,5 @@ headers += \
 include opal/sys/x86_64/Makefile.am
 include opal/sys/arm64/Makefile.am
 include opal/sys/powerpc/Makefile.am
+include opal/sys/riscv64/Makefile.am
 include opal/sys/gcc_builtin/Makefile.am

opal/include/opal/sys/riscv64/Makefile.am

@@ -0,0 +1,15 @@
+#
+# Copyright (c) 2025      Software System Team, SANECHIPS.
+#                         All rights reserved.
+# $COPYRIGHT$
+#
+# Additional copyrights may follow
+#
+# $HEADER$
+#
+
+# This makefile.am does not stand on its own - it is included from opal/include/Makefile.am
+
+headers += \
+	opal/sys/riscv64/timer.h
+

opal/include/opal/sys/riscv64/timer.h

@@ -0,0 +1,34 @@
+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2025      Software System Team, SANECHIPS.
+ *                         All rights reserved.
+ * $COPYRIGHT$
+ *
+ * Additional copyrights may follow
+ *
+ * $HEADER$
+ */
+
+#ifndef OPAL_SYS_ARCH_TIMER_H
+#define OPAL_SYS_ARCH_TIMER_H 1
+
+typedef uint64_t opal_timer_t;
+
+#if OPAL_C_GCC_INLINE_ASSEMBLY
+
+static inline opal_timer_t opal_sys_timer_get_cycles(void)
+{
+    opal_timer_t ret;
+    __asm__ __volatile__("fence.i");
+    __asm__ __volatile__("fence r, r" ::: "memory");
+    __asm__ __volatile__("rdtime %0" : "=r"(ret));
+
+    return ret;
+}
+
+#define OPAL_HAVE_SYS_TIMER_GET_CYCLES 1
+
+#endif /* OPAL_C_GCC_INLINE_ASSEMBLY */
+
+#endif /* ! OPAL_SYS_ARCH_TIMER_H */
+

opal/include/opal/sys/timer.h

@@ -63,6 +63,8 @@ BEGIN_C_DECLS
 #    include "opal/sys/arm64/timer.h"
 #elif defined(PLATFORM_ARCH_POWERPC)
 #    include "opal/sys/powerpc/timer.h"
+#elif defined(PLATFORM_ARCH_RISCV)
+#    include "opal/sys/riscv64/timer.h"
 #endif
 
 #ifndef DOXYGEN

opal/mca/timer/linux/configure.m4

@@ -47,7 +47,7 @@ AC_DEFUN([MCA_opal_timer_linux_CONFIG],[
                  [timer_linux_happy="no"])])
 
    case "${host}" in
-   i?86-*linux*|x86_64*linux*|ia64-*linux*|powerpc-*linux*|powerpc64-*linux*|powerpc64le-*linux*|powerpcle-*linux*|sparc*-*linux*|aarch64-*linux*)
+   i?86-*linux*|x86_64*linux*|ia64-*linux*|powerpc-*linux*|powerpc64-*linux*|powerpc64le-*linux*|powerpcle-*linux*|sparc*-*linux*|aarch64-*linux*|riscv64-*linux*)
         AS_IF([test "$timer_linux_happy" = "yes"],
               [AS_IF([test -r "/proc/cpuinfo"],
                      [timer_linux_happy="yes"],

opal/mca/timer/linux/timer_linux_component.c

@@ -18,6 +18,8 @@
  * Copyright (c) 2016 Broadcom Limited. All rights reserved.
  * Copyright (c) 2022      Amazon.com, Inc. or its affiliates.
  *                         All Rights reserved.
+ * Copyright (c) 2025      Software System Team, SANECHIPS.
+ *                         All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -29,6 +31,7 @@
 
 #include <string.h>
 #include <time.h>
+#include <arpa/inet.h>
 
 #include "opal/constants.h"
 #include "opal/mca/timer/base/base.h"
@@ -177,6 +180,20 @@ static int opal_timer_linux_find_freq(void)
         }
     }
 
+#if defined(PLATFORM_ARCH_RISCV)
+    if (0 == opal_timer_linux_freq) {
+        /* read timebase-frequency in device-tree */
+        FILE *fp_rv = fopen("/proc/device-tree/cpus/timebase-frequency", "rb");
+        if (NULL == fp_rv) {
+            return OPAL_ERR_IN_ERRNO;
+        }
+        if (1 == fread(&opal_timer_linux_freq, 4, 1, fp_rv)){
+            opal_timer_linux_freq = ntohl(opal_timer_linux_freq);
+        }
+        fclose(fp_rv);
+    }
+#endif
+
     fclose(fp);
 
     /* convert the timer frequency to MHz to avoid an extra operation when

test/util/Makefile.am

@@ -43,7 +43,8 @@ check_PROGRAMS = \
 	opal_bit_ops \
 	opal_path_nfs \
         opal_json \
-        opal_sha256
+        opal_sha256 \
+	opal_timer
 
 TESTS = \
 	$(check_PROGRAMS)
@@ -95,11 +96,11 @@ opal_path_nfs_DEPENDENCIES = $(opal_path_nfs_LDADD)
 #        $(top_builddir)/test/support/libsupport.a
 #opal_os_path_DEPENDENCIES = $(opal_os_path_LDADD)
 
-#opal_timer_SOURCES = opal_timer.c
-#opal_timer_LDADD = \
-#        $(top_builddir)/opal/lib@[email protected] \
-#        $(top_builddir)/test/support/libsupport.a
-#opal_timer_DEPENDENCIES = $(opal_timer_LDADD)
+opal_timer_SOURCES = opal_timer.c
+opal_timer_LDADD = \
+        $(top_builddir)/opal/lib@[email protected] \
+        $(top_builddir)/test/support/libsupport.a
+opal_timer_DEPENDENCIES = $(opal_timer_LDADD)
 
 
 #orte_sys_info_SOURCES = orte_sys_info.c