[PATCH v5 01/13] meson: Introduce new instruction set enqcmd to the build system.

[Yichen Wang <yichen.wang@bytedance.com>]

From: Hao Xiang <hao.xiang@linux.dev>

Enable instruction set enqcmd in build.

Signed-off-by: Hao Xiang <hao.xiang@linux.dev>
Signed-off-by: Yichen Wang <yichen.wang@bytedance.com>
---
 meson.build                   | 14 ++++++++++++++
 meson_options.txt             |  2 ++
 scripts/meson-buildoptions.sh |  3 +++
 3 files changed, 19 insertions(+)

diff --git a/meson.build b/meson.build
index 6a93da48e1..af650cfabf 100644
--- a/meson.build
+++ b/meson.build
@@ -2893,6 +2893,20 @@ config_host_data.set('CONFIG_AVX512BW_OPT', get_option('avx512bw') \
     int main(int argc, char *argv[]) { return bar(argv[0]); }
   '''), error_message: 'AVX512BW not available').allowed())
 
+config_host_data.set('CONFIG_DSA_OPT', get_option('enqcmd') \
+  .require(have_cpuid_h, error_message: 'cpuid.h not available, cannot enable ENQCMD') \
+  .require(cc.links('''
+    #include <stdint.h>
+    #include <cpuid.h>
+    #include <immintrin.h>
+    static int __attribute__((target("enqcmd"))) bar(void *a) {
+      uint64_t dst[8] = { 0 };
+      uint64_t src[8] = { 0 };
+      return _enqcmd(dst, src);
+    }
+    int main(int argc, char *argv[]) { return bar(argv[argc - 1]); }
+  '''), error_message: 'ENQCMD not available').allowed())
+
 # For both AArch64 and AArch32, detect if builtins are available.
 config_host_data.set('CONFIG_ARM_AES_BUILTIN', cc.compiles('''
     #include <arm_neon.h>
diff --git a/meson_options.txt b/meson_options.txt
index 0269fa0f16..4ed820bb8d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -121,6 +121,8 @@ option('avx2', type: 'feature', value: 'auto',
        description: 'AVX2 optimizations')
 option('avx512bw', type: 'feature', value: 'auto',
        description: 'AVX512BW optimizations')
+option('enqcmd', type: 'feature', value: 'disabled',
+       description: 'ENQCMD optimizations')
 option('keyring', type: 'feature', value: 'auto',
        description: 'Linux keyring support')
 option('libkeyutils', type: 'feature', value: 'auto',
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index cfadb5ea86..280e117687 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -95,6 +95,7 @@ meson_options_help() {
   printf "%s\n" '  auth-pam        PAM access control'
   printf "%s\n" '  avx2            AVX2 optimizations'
   printf "%s\n" '  avx512bw        AVX512BW optimizations'
+  printf "%s\n" '  enqcmd          ENQCMD optimizations'
   printf "%s\n" '  blkio           libblkio block device driver'
   printf "%s\n" '  bochs           bochs image format support'
   printf "%s\n" '  bpf             eBPF support'
@@ -239,6 +240,8 @@ _meson_option_parse() {
     --disable-avx2) printf "%s" -Davx2=disabled ;;
     --enable-avx512bw) printf "%s" -Davx512bw=enabled ;;
     --disable-avx512bw) printf "%s" -Davx512bw=disabled ;;
+    --enable-enqcmd) printf "%s" -Denqcmd=enabled ;;
+    --disable-enqcmd) printf "%s" -Denqcmd=disabled ;;
     --enable-gcov) printf "%s" -Db_coverage=true ;;
     --disable-gcov) printf "%s" -Db_coverage=false ;;
     --enable-lto) printf "%s" -Db_lto=true ;;
-- 
Yichen Wang