[lttng-dev] [PATCH urcu] Add support for the RISC-V architecture
Mathieu Desnoyers
mathieu.desnoyers at efficios.com
Fri Mar 23 17:51:52 EDT 2018
----- On Mar 23, 2018, at 5:22 PM, Michael Jeanson mjeanson at efficios.com wrote:
> On 2018-03-21 19:00, Mathieu Desnoyers wrote:
>> ----- On Mar 21, 2018, at 5:38 PM, Michael Jeanson mjeanson at efficios.com wrote:
>>
>>> Tested in QEMU 2.12.0-rc0, requires --disable-compiler-tls to go
>>> through the benchmarks reliably.
>>
>> Is it possible to find a RISC-V board in the wild ? (for testing ?)
>
> Pretty hard for the moment, the number of boards running Linux in the
> wild is less than 30 or so. However, porting efforts have already
> started at Fedora and Debian using the qemu system emulator. I thought
> it would be better to have upstream with support with documented
> limitations than have each distro do their homemade patches.
>
>>
>> I've seen gcc builtins get it wrong barrier-wise on some architectures
>> in the past, so I'd really like to test on proper hardware.
>
> A first batch of boards will start shipping in a couple months, the
> Debian porters will get at least one, I should be able to have them run
> the regression tests on it.
Good point. Merged, thanks!
Mathieu
>
>>
>> Thanks,
>>
>> Mathieu
>>
>>
>>>
>>> Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
>>> ---
>>> configure.ac | 1 +
>>> include/Makefile.am | 2 ++
>>> include/urcu/arch/riscv.h | 49 ++++++++++++++++++++++++++++++++++++++++++++
>>> include/urcu/uatomic/riscv.h | 44 +++++++++++++++++++++++++++++++++++++++
>>> 4 files changed, 96 insertions(+)
>>> create mode 100644 include/urcu/arch/riscv.h
>>> create mode 100644 include/urcu/uatomic/riscv.h
>>>
>>> diff --git a/configure.ac b/configure.ac
>>> index d0b4a9a..9145081 100644
>>> --- a/configure.ac
>>> +++ b/configure.ac
>>> @@ -151,6 +151,7 @@ AS_CASE([$host_cpu],
>>> [tile*], [ARCHTYPE="tile"],
>>> [hppa*], [ARCHTYPE="hppa"],
>>> [m68k], [ARCHTYPE="m68k"],
>>> + [riscv*], [ARCHTYPE="riscv"],
>>> [ARCHTYPE="unknown"]
>>> )
>>>
>>> diff --git a/include/Makefile.am b/include/Makefile.am
>>> index dcdf304..36667b4 100644
>>> --- a/include/Makefile.am
>>> +++ b/include/Makefile.am
>>> @@ -27,6 +27,7 @@ EXTRA_DIST = urcu/arch/aarch64.h \
>>> urcu/arch/mips.h \
>>> urcu/arch/nios2.h \
>>> urcu/arch/ppc.h \
>>> + urcu/arch/riscv.h \
>>> urcu/arch/s390.h \
>>> urcu/arch/sparc64.h \
>>> urcu/arch/tile.h \
>>> @@ -43,6 +44,7 @@ EXTRA_DIST = urcu/arch/aarch64.h \
>>> urcu/uatomic/mips.h \
>>> urcu/uatomic/nios2.h \
>>> urcu/uatomic/ppc.h \
>>> + urcu/uatomic/riscv.h \
>>> urcu/uatomic/s390.h \
>>> urcu/uatomic/sparc64.h \
>>> urcu/uatomic/tile.h \
>>> diff --git a/include/urcu/arch/riscv.h b/include/urcu/arch/riscv.h
>>> new file mode 100644
>>> index 0000000..1fd7d62
>>> --- /dev/null
>>> +++ b/include/urcu/arch/riscv.h
>>> @@ -0,0 +1,49 @@
>>> +#ifndef _URCU_ARCH_RISCV_H
>>> +#define _URCU_ARCH_RISCV_H
>>> +
>>> +/*
>>> + * arch/riscv.h: definitions for the RISC-V architecture
>>> + *
>>> + * Copyright (c) 2018 Michael Jeanson <mjeanson at efficios.com>
>>> + *
>>> + * This library is free software; you can redistribute it and/or
>>> + * modify it under the terms of the GNU Lesser General Public
>>> + * License as published by the Free Software Foundation; either
>>> + * version 2.1 of the License, or (at your option) any later version.
>>> + *
>>> + * This library 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
>>> + * Lesser General Public License for more details.
>>> + *
>>> + * You should have received a copy of the GNU Lesser General Public
>>> + * License along with this library; if not, write to the Free Software
>>> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
>>> + */
>>> +
>>> +#include <urcu/compiler.h>
>>> +#include <urcu/config.h>
>>> +#include <urcu/syscall-compat.h>
>>> +
>>> +#ifdef __cplusplus
>>> +extern "C" {
>>> +#endif
>>> +
>>> +#include <stdlib.h>
>>> +#include <sys/time.h>
>>> +
>>> +/*
>>> + * On Linux, define the membarrier system call number if not yet available in
>>> + * the system headers.
>>> + */
>>> +#if (defined(__linux__) && !defined(__NR_membarrier))
>>> +#define __NR_membarrier 283
>>> +#endif
>>> +
>>> +#ifdef __cplusplus
>>> +}
>>> +#endif
>>> +
>>> +#include <urcu/arch/generic.h>
>>> +
>>> +#endif /* _URCU_ARCH_RISCV_H */
>>> diff --git a/include/urcu/uatomic/riscv.h b/include/urcu/uatomic/riscv.h
>>> new file mode 100644
>>> index 0000000..a6700e1
>>> --- /dev/null
>>> +++ b/include/urcu/uatomic/riscv.h
>>> @@ -0,0 +1,44 @@
>>> +/*
>>> + * Atomic exchange operations for the RISC-V architecture. Let GCC do it.
>>> + *
>>> + * Copyright (c) 2018 Michael Jeanson <mjeanson at efficios.com>
>>> + *
>>> + * Permission is hereby granted, free of charge, to any person obtaining a copy
>>> + * of this software and associated documentation files (the "Software"), to
>>> + * deal in the Software without restriction, including without limitation the
>>> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
>>> + * sell copies of the Software, and to permit persons to whom the Software is
>>> + * furnished to do so, subject to the following conditions:
>>> + *
>>> + * The above copyright notice and this permission notice shall be included in
>>> + * all copies or substantial portions of the Software.
>>> + *
>>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
>>> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
>>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
>>> + * IN THE SOFTWARE.
>>> + */
>>> +
>>> +#ifndef _URCU_ARCH_UATOMIC_RISCV_H
>>> +#define _URCU_ARCH_UATOMIC_RISCV_H
>>> +
>>> +#include <urcu/compiler.h>
>>> +#include <urcu/system.h>
>>> +
>>> +#ifdef __cplusplus
>>> +extern "C" {
>>> +#endif
>>> +
>>> +#define UATOMIC_HAS_ATOMIC_BYTE
>>> +#define UATOMIC_HAS_ATOMIC_SHORT
>>> +
>>> +#ifdef __cplusplus
>>> +}
>>> +#endif
>>> +
>>> +#include <urcu/uatomic/generic.h>
>>> +
>>> +#endif /* _URCU_ARCH_UATOMIC_RISCV_H */
>>> --
>>> 2.7.4
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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