Date:   Fri, 26 Apr 2019 16:35:31 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        lkml <linux-kernel@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: perf tools build broken after v5.1-rc1

Em Fri, Apr 26, 2019 at 04:28:34PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Apr 25, 2019 at 06:48:00PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Apr 22, 2019 at 12:20:27PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Fri, Apr 19, 2019 at 04:32:58PM -0700, Vineet Gupta escreveu:
> > > > When building perf for ARC (v5.1-rc2) I get the following
> > >  
> > > > | In file included from bench/futex-hash.c:26:
> > > > | bench/futex.h: In function 'futex_wait':
> > > > | bench/futex.h:37:10: error: 'SYS_futex' undeclared (first use in this function);
> > >  
> > > > git bisect led to 1a787fc5ba18ac767e635c58d06a0b46876184e3 ("tools headers uapi:
> > > > Sync copy of asm-generic/unistd.h with the kernel sources")
> > > 
> > > Humm, I have to check why this:
> > > 
> > > [perfbuilder@...co ~]$ podman images | grep ARC
> > > docker.io/acmel/linux-perf-tools-build-fedora                24-x-ARC-uClibc          4c259582a8e6   5 weeks ago      846 MB
> > > [perfbuilder@...co ~]$
> > > 
> > > isn't catching this... :-\
> > > 
> > > FROM docker.io/fedora:24
> > > MAINTAINER Arnaldo Carvalho de Melo <acme@...nel.org>
> > > ENV TOOLCHAIN=arc_gnu_2017.09-rc2_prebuilt_uclibc_le_arc700_linux_install
> > > ENV CROSS=arc-linux-
> > > ENV SOURCEFILE=${TOOLCHAIN}.tar.gz
> > > RUN dnf -y install make flex bison binutils gcc wget tar bzip2 bc findutils xz
> > > RUN wget https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2017.09-rc2/${SOURCEFILE}
> > > <SNIP>
> > > COPY rx_and_build.sh /
> > > ENV EXTRA_MAKE_ARGS=NO_LIBBPF=1
> > > ENV ARCH=arc
> > > ENV CROSS_COMPILE=/${TOOLCHAIN}/bin/${CROSS}
> > > ENV EXTRA_CFLAGS=-matomic
> > 
> > So, now I have a libnuma crossbuilt in this container that allows me to
> > build a ARC perf binary linked with zlib and numactl-devel, but only
> > after I applied the fix below.
> > 
> > Can you please provide the feature detection header in the build? I.e.
> > what I have with my ARC cross build container right now, after applying
> > the patch below is:
> 
> So, switched from the uCLibc build system to the glibc based one, so
> that I could get elfutils building (it needs argp that isn't available
> with uCLibc) I have it reproduced, see below, now I'm testing with the
> fix, which is to grab the unistd.h files you noticed missing for the
> arches that are present in tools/arch/, will post results soon

Yep, now it builds:

/tmp/build/perf/perf: ELF 32-bit LSB executable, *unknown arch 0xc3* version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-arc.so.2, for GNU/Linux 3.9.0, with debug_info, not stripped

With this patch:

commit dd423246b321967eace3f3e0fe73d638050b447c
Author: Arnaldo Carvalho de Melo <acme@...hat.com>
Date:   Mon Apr 22 15:21:35 2019 -0300

    WIP
    
    Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

diff --git a/tools/arch/arc/include/uapi/asm/unistd.h b/tools/arch/arc/include/uapi/asm/unistd.h
new file mode 100644
index 000000000000..5eafa1115162
--- /dev/null
+++ b/tools/arch/arc/include/uapi/asm/unistd.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/******** no-legacy-syscalls-ABI *******/
+
+/*
+ * Non-typical guard macro to enable inclusion twice in ARCH sys.c
+ * That is how the Generic syscall wrapper generator works
+ */
+#if !defined(_UAPI_ASM_ARC_UNISTD_H) || defined(__SYSCALL)
+#define _UAPI_ASM_ARC_UNISTD_H
+
+#define __ARCH_WANT_RENAMEAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SET_GET_RLIMIT
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_VFORK
+#define __ARCH_WANT_SYS_FORK
+#define __ARCH_WANT_TIME32_SYSCALLS
+
+#define sys_mmap2 sys_mmap_pgoff
+
+#include <asm-generic/unistd.h>
+
+#define NR_syscalls	__NR_syscalls
+
+/* Generic syscall (fs/filesystems.c - lost in asm-generic/unistd.h */
+#define __NR_sysfs		(__NR_arch_specific_syscall + 3)
+
+/* ARC specific syscall */
+#define __NR_cacheflush		(__NR_arch_specific_syscall + 0)
+#define __NR_arc_settls		(__NR_arch_specific_syscall + 1)
+#define __NR_arc_gettls		(__NR_arch_specific_syscall + 2)
+#define __NR_arc_usr_cmpxchg	(__NR_arch_specific_syscall + 4)
+
+__SYSCALL(__NR_cacheflush, sys_cacheflush)
+__SYSCALL(__NR_arc_settls, sys_arc_settls)
+__SYSCALL(__NR_arc_gettls, sys_arc_gettls)
+__SYSCALL(__NR_arc_usr_cmpxchg, sys_arc_usr_cmpxchg)
+__SYSCALL(__NR_sysfs, sys_sysfs)
+
+#undef __SYSCALL
+
+#endif
diff --git a/tools/arch/hexagon/include/uapi/asm/unistd.h b/tools/arch/hexagon/include/uapi/asm/unistd.h
new file mode 100644
index 000000000000..432c4db1b623
--- /dev/null
+++ b/tools/arch/hexagon/include/uapi/asm/unistd.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Syscall support for Hexagon
+ *
+ * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ *  The kernel pulls this unistd.h in three different ways:
+ *  1.  the "normal" way which gets all the __NR defines
+ *  2.  with __SYSCALL defined to produce function declarations
+ *  3.  with __SYSCALL defined to produce syscall table initialization
+ *  See also:  syscalltab.c
+ */
+
+#define sys_mmap2 sys_mmap_pgoff
+#define __ARCH_WANT_RENAMEAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SET_GET_RLIMIT
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_VFORK
+#define __ARCH_WANT_SYS_FORK
+#define __ARCH_WANT_TIME32_SYSCALLS
+
+#include <asm-generic/unistd.h>
diff --git a/tools/arch/riscv/include/uapi/asm/unistd.h b/tools/arch/riscv/include/uapi/asm/unistd.h
new file mode 100644
index 000000000000..0e2eeeb1fd27
--- /dev/null
+++ b/tools/arch/riscv/include/uapi/asm/unistd.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2018 David Abdurachmanov <david.abdurachmanov@...il.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef __LP64__
+#define __ARCH_WANT_NEW_STAT
+#define __ARCH_WANT_SET_GET_RLIMIT
+#endif /* __LP64__ */
+
+#include <asm-generic/unistd.h>
+
+/*
+ * Allows the instruction cache to be flushed from userspace.  Despite RISC-V
+ * having a direct 'fence.i' instruction available to userspace (which we
+ * can't trap!), that's not actually viable when running on Linux because the
+ * kernel might schedule a process on another hart.  There is no way for
+ * userspace to handle this without invoking the kernel (as it doesn't know the
+ * thread->hart mappings), so we've defined a RISC-V specific system call to
+ * flush the instruction cache.
+ *
+ * __NR_riscv_flush_icache is defined to flush the instruction cache over an
+ * address range, with the flush applying to either all threads or just the
+ * caller.  We don't currently do anything with the address range, that's just
+ * in there for forwards compatibility.
+ */
+#ifndef __NR_riscv_flush_icache
+#define __NR_riscv_flush_icache (__NR_arch_specific_syscall + 15)
+#endif
+__SYSCALL(__NR_riscv_flush_icache, sys_riscv_flush_icache)

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