[SPR] i386: Add syscall to enable AMX for latest kernels

gcc/testsuite/ChangeLog:

	* gcc.target/i386/amx-check.h (request_perm_xtile_data):
	New function to check if AMX is usable and enable AMX.
	(main): Run test if AMX is usable.

url:https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=5e377d21f1f345d8b157b9bc306e02bb9bd45e01

0002-i386-Add-syscall-to-enable-AMX-for-latest-kernels.patch

@@ -0,0 +1,77 @@
+From 5e377d21f1f345d8b157b9bc306e02bb9bd45e01 Mon Sep 17 00:00:00 2001
+From: Haochen Jiang <haochen.jiang@intel.com>
+Date: Thu, 16 Jun 2022 00:15:53 -0700
+Subject: [PATCH] i386: Add syscall to enable AMX for latest kernels
+
+gcc/testsuite/ChangeLog:
+
+	* gcc.target/i386/amx-check.h (request_perm_xtile_data):
+	New function to check if AMX is usable and enable AMX.
+	(main): Run test if AMX is usable.
+---
+ gcc/testsuite/gcc.target/i386/amx-check.h | 30 +++++++++++++++++++++++
+ 1 file changed, 30 insertions(+)
+
+diff --git a/gcc/testsuite/gcc.target/i386/amx-check.h b/gcc/testsuite/gcc.target/i386/amx-check.h
+index 434b0e59703..6fff5ff4631 100644
+--- a/gcc/testsuite/gcc.target/i386/amx-check.h
++++ b/gcc/testsuite/gcc.target/i386/amx-check.h
+@@ -4,11 +4,24 @@
+ #include <stdlib.h>
+ #include <string.h>
+ #include <stdint.h>
++#include <unistd.h>
++#ifdef __linux__
++#include <sys/syscall.h>
++#endif
+ #ifdef DEBUG
+ #include <stdio.h>
+ #endif
+ #include "cpuid.h"
+ 
++#define XFEATURE_XTILECFG	17
++#define XFEATURE_XTILEDATA	18
++#define XFEATURE_MASK_XTILECFG	(1 << XFEATURE_XTILECFG)
++#define XFEATURE_MASK_XTILEDATA	(1 << XFEATURE_XTILEDATA)
++#define XFEATURE_MASK_XTILE	(XFEATURE_MASK_XTILECFG | XFEATURE_MASK_XTILEDATA)
++
++#define ARCH_GET_XCOMP_PERM	0x1022
++#define ARCH_REQ_XCOMP_PERM	0x1023
++
+ /* TODO: The tmm emulation is temporary for current
+    AMX implementation with no tmm regclass, should
+    be changed in the future. */
+@@ -44,6 +57,20 @@ typedef struct __tile
+ /* Stride (colum width in byte) used for tileload/store */
+ #define _STRIDE 64
+ 
++#ifdef __linux__
++/* We need syscall to use amx functions */
++int request_perm_xtile_data()
++{
++  unsigned long bitmask;
++
++  if (syscall (SYS_arch_prctl, ARCH_REQ_XCOMP_PERM, XFEATURE_XTILEDATA) ||
++      syscall (SYS_arch_prctl, ARCH_GET_XCOMP_PERM, &bitmask))
++    return 0;
++
++  return (bitmask & XFEATURE_MASK_XTILE) != 0;
++}
++#endif
++
+ /* Initialize tile config by setting all tmm size to 16x64 */
+ void init_tile_config (__tilecfg_u *dst)
+ {
+@@ -185,6 +212,9 @@ main ()
+ #endif
+ #ifdef AMX_BF16
+       && __builtin_cpu_supports ("amx-bf16")
++#endif
++#ifdef __linux__
++      && request_perm_xtile_data ()
+ #endif
+       )
+     {
+-- 
+2.18.2
+

gcc-12.spec

@@ -84,7 +84,7 @@
 Summary: Various compilers (C, C++, Objective-C, ...)
 Name: %{?scl_prefix}gcc
 Version: 12.2.1
-Release: 5
+Release: 6
 # libgcc, libgfortran, libgomp, libstdc++ and crtstuff have
 # GCC Runtime Exception.
 License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
@@ -133,6 +133,7 @@ Provides: %{?scl_prefix}gcc(major) = %{gcc_major}
 
 
 Patch0: 0001-change-gcc-version.patch
+Patch1: 0002-i386-Add-syscall-to-enable-AMX-for-latest-kernels.patch
 
 
 # On ARM EABI systems, we do want -gnueabi to be part of the
@@ -591,6 +592,7 @@ not stable, so plugins must be rebuilt any time GCC is updated.
 %setup -q -n gcc-12.2.0
 
 %patch0 -p1
+%patch1 -p1
 
 echo 'openEuler %{version}-%{release}' > gcc/DEV-PHASE
 
@@ -2647,6 +2649,9 @@ end
 %doc rpm.doc/changelogs/libcc1/ChangeLog*
 
 %changelog
+* Wed Nov 09 2022 Haochen Jiang <haochen.jiang@intel.com> 12.2.1-6
+- i386: Add syscall to enable AMX for latest kernels
+
 * Wed Nov 02 2022 liyancheng <412998149@qq.com> 12.2.1-5
 - Change isl dependency from Source to BuildRequire