From patchwork Mon Jul 4 19:31:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ammar Faizi X-Patchwork-Id: 12905804 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B1FDC43334 for ; Mon, 4 Jul 2022 19:32:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231186AbiGDTcQ (ORCPT ); Mon, 4 Jul 2022 15:32:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230215AbiGDTcQ (ORCPT ); Mon, 4 Jul 2022 15:32:16 -0400 Received: from gnuweeb.org (gnuweeb.org [51.81.211.47]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C491214 for ; Mon, 4 Jul 2022 12:32:15 -0700 (PDT) Received: from integral2.. (unknown [36.81.65.188]) by gnuweeb.org (Postfix) with ESMTPSA id 52159800EF; Mon, 4 Jul 2022 19:32:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gnuweeb.org; s=default; t=1656963134; bh=1KhcSFLX9L3TrgvOtzZHJ8rFeL1OjQGo7tOoiLvRrWA=; h=From:To:Cc:Subject:Date:From; b=S1TQL7A84X396zoNE0PXUheRyOewIQBB+19O/Ap6xE+KnMvUm/zKwI2emN49iHP0R wm2A/LYmKyOMOUhVHZgI+eG+NJWdgKALHDDdoEf0bNmMm7sbGXQ+6z4nU2aCk4Lc16 gOXS508L6uO3PS0Go3IvZ2VwTHUj33LjNzWnzq7PbkOADTMfeMIi2VBrVdtF5l9UM8 +UJxZ9Gq6G5EUvH5+kDQpI8F0TyEyzwI303+QaIQSd7AGfzagLoOdmjBKkZiVDJv5u chADslF88OILcRIpqZ+ry9I8LO7hSh/IsZRWyKMbdByqNTUg9gTKzS9+rZEeWw+HC/ elm8Mdb3mSaGA== From: Ammar Faizi To: Jens Axboe Cc: Ammar Faizi , Alviro Iskandar Setiawan , Fernanda Ma'rouf , Hao Xu , Pavel Begunkov , io-uring Mailing List , GNU/Weeb Mailing List Subject: [PATCH liburing v4 00/10] aarch64 support Date: Tue, 5 Jul 2022 02:31:45 +0700 Message-Id: <20220704192827.338771-1-ammar.faizi@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Ammar Faizi Hi Jens, This is v4 revision of aarch64 support. This series contains nolibc support for aarch64 and one extra irrelevant cleanup (patch #1). The missing bit from aarch64 is get_page_size() which is a bit complicated to implement without libc. aarch64 supports three values of page size: 4K, 16K, and 64K which are selected at kernel compilation time. Therefore, we can't hard code the page size for this arch. In this series we utilize open(), read() and close() syscall to find the page size from /proc/self/auxv. The auxiliary vector contains information about the page size, it is located at `AT_PAGESZ` keyval pair. For more details about the auxv data structure, check the link below. Link: https://github.com/torvalds/linux/blob/v5.19-rc4/fs/binfmt_elf.c#L260 Link: https://lwn.net/Articles/631631/ There are 10 patches in this series. Summary: - Patch 1 is just a trivial changelog fix. - Patch 2 and 3 are to add open() and read() syscall. - Patch 4 is to remove __INTERNAL__LIBURING_SYSCALL_H checks. - Patch 5 is to add get_page_size() function. - Patch 6 is just a trivial style fixup for #ifdef and friends. - Patch 7 is to enable the nolibc support for aarch64. - Patch 8 is to add nolibc test. - Patch 9 is for GitHub bot build. - Patch 10 is to update the CHANGELOG to note aarch64 nolibc support. I have built it with GitHub bot and it compiles just fine. But I don't have an aarch64 machine to run the tests. Since you are using aarch64, I can rely on you to test it. How to test this? make clean; ./configure --nolibc; make -j8; ldd src/liburing.so.2.3; # Make sure you don't see libc.so from the `ldd` command. make runtests; Please give it a test, thanks! ## Changelog v3 -> v4: - Simplify __get_page_size() function. - Change __sys_read() return type from int to ssize_t. - Append Reviewed-by tags from Alviro Iskandar Setiawan. - Fix git am complain: space before tab in indent. v2 -> v3: - No need to init the static var to zero. - Split style fixup into a separate patch. - Add nolibc test to test get_page_size() function. - Use __NR_openat when __NR_open is not defined on the arch. - Split open/read/close in get_page_size() into a new function. - Cache the get_page_size() fallback value when we fail on the syscalls. v1 -> v2: - Drop aarch64 renaming directory patch. - Fallback the page size to 4K if we fail to get it. - Cache the page size after we read it from /proc/self/auxv. - Massage commit messages. - Note aarch64 nolibc support in CHANGELOG. Signed-off-by: Ammar Faizi --- Ammar Faizi (10): CHANGELOG: Fixup missing space arch: syscall: Add `__sys_open()` syscall arch: syscall: Add `__sys_read()` syscall arch: Remove `__INTERNAL__LIBURING_LIB_H` checks arch/aarch64: lib: Add `get_page_size()` function lib: Style fixup for #if / #elif / #else / #endif lib: Enable nolibc support for aarch64 test: Add nolibc test .github: Enable aarch64 nolibc build for GitHub bot CHANGELOG: Note about aarch64 support .github/workflows/build.yml | 2 +- CHANGELOG | 7 ++++- src/arch/aarch64/lib.h | 48 +++++++++++++++++++++++++++++ src/arch/aarch64/syscall.h | 4 --- src/arch/generic/lib.h | 4 --- src/arch/generic/syscall.h | 20 ++++++++++--- src/arch/syscall-defs.h | 19 ++++++++++++ src/arch/x86/lib.h | 4 --- src/arch/x86/syscall.h | 4 --- src/lib.h | 32 ++++++++++---------- src/syscall.h | 2 -- test/Makefile | 1 + test/nolibc.c | 60 +++++++++++++++++++++++++++++++++++++ 13 files changed, 167 insertions(+), 40 deletions(-) create mode 100644 src/arch/aarch64/lib.h create mode 100644 test/nolibc.c base-commit: f8eb5f804288e10ae7ef442ef482e4dd8b18fee7