From patchwork Mon Feb 6 20:14:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evan Green X-Patchwork-Id: 13130556 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 BBE16C05027 for ; Mon, 6 Feb 2023 20:16:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229478AbjBFUQJ (ORCPT ); Mon, 6 Feb 2023 15:16:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51124 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230248AbjBFUP5 (ORCPT ); Mon, 6 Feb 2023 15:15:57 -0500 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05B142B28E for ; Mon, 6 Feb 2023 12:15:42 -0800 (PST) Received: by mail-pj1-x1030.google.com with SMTP id t12-20020a17090aae0c00b00229f4cff534so13925021pjq.1 for ; Mon, 06 Feb 2023 12:15:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5QMxDhZ75IYuxFalbrxLxVMgMvXcbdvnhnkaLqUhc+4=; b=h/K1xPkYuAladagqvnqdEObwLc3I++hRM7ygnQ2FWJr4dQ+NkKfwjCYv4AZW0J/fwi LQISa+kgp1HPMijrVjeord7FE0i5YBU63rWz5ruKW+VR6fz0mKm4sPzzDQ3b7sHqAJqu 5s5FHCgSboqFOPi6+2mRfBVjb6ruhIRiLlcmgbtSOBcG3ugdpGU4nLDiyh5rS6NQjWtG kQKYfhoKgsFC1y4IuUgzY6yhKDZrzXd+Cd50qfizClaXRGR75Ot0gyTLgmirP0lhYesJ 0ufnay2uR7KlqVSrC2Gw4rTerieNxMHekKe2rLvJWZHLTB4m0NJU5BYtvJ2l9lgJ2Nsf 6lpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5QMxDhZ75IYuxFalbrxLxVMgMvXcbdvnhnkaLqUhc+4=; b=g/G39mxzP6ggcpaZiqB9eFAquei80VhH0GJCcanEmu5Sbt4+uSqrApbjCu/t8TBVuR kAQGttXUJHlOT8Ys0maA4JVQFeC4+PvrptWxkvk9Ir9biRqgqZBpBhUjlcbZ+LcF5esr iC2OGAcxJxzwTP54aKo1RIuMQVPRvImeBmJndSdcKa+O3Y8AiEko6mFAZG8P9OlDSbRv DTVVnKJ2r7NFArV5JttFdugNNJ6cp+P+7CG8vpsVEWZ1DGhmiUEiow89ZHrD0B5upKo8 Z6GKy6bJWejTCihnAfkgk6Lk941227dnlGegz5v8G0fKRPE2TQtegano0VwpeO/oCoUu jGSg== X-Gm-Message-State: AO0yUKV+PaZFKrB4umn7Md8wxHDGf7PtEMxF7x4DbRRzsDVFtJmrdhex liOUBbfnmMdRzUDmeiDjNcIlwA== X-Google-Smtp-Source: AK7set85zbKwtw5aODIZ5cYO4p8jjvMu57n9mPKmID0sKGJht50D5yMZ8ibBp4s5msYzjPdKfqyc8A== X-Received: by 2002:a05:6a20:e688:b0:bc:92cd:1536 with SMTP id mz8-20020a056a20e68800b000bc92cd1536mr259465pzb.61.1675714541445; Mon, 06 Feb 2023 12:15:41 -0800 (PST) Received: from evan.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id k10-20020a63ab4a000000b004df4fbb9823sm6425079pgp.68.2023.02.06.12.15.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Feb 2023 12:15:41 -0800 (PST) From: Evan Green To: Palmer Dabbelt Cc: Conor Dooley , vineetg@rivosinc.com, heiko@sntech.de, slewis@rivosinc.com, Evan Green , Albert Ou , Catalin Marinas , Mark Brown , Palmer Dabbelt , Paul Walmsley , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v2 6/6] selftests: Test the new RISC-V hwprobe interface Date: Mon, 6 Feb 2023 12:14:55 -0800 Message-Id: <20230206201455.1790329-7-evan@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230206201455.1790329-1-evan@rivosinc.com> References: <20230206201455.1790329-1-evan@rivosinc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This adds a test for the recently added RISC-V interface for probing hardware capabilities. It happens to be the first selftest we have for RISC-V, so I've added some infrastructure for those as well. The build stuff looks pretty straight-forward, but there's also a tiny C library to avoid coupling this to any userspace implementation. Co-developed-by: Palmer Dabbelt Signed-off-by: Palmer Dabbelt Signed-off-by: Evan Green --- Changes in v2: - Updated the selftests to the new API and added some more. - Fixed indentation, comments in .S, and general checkpatch complaints. --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/riscv/Makefile | 58 ++++++++++++ .../testing/selftests/riscv/hwprobe/Makefile | 10 +++ .../testing/selftests/riscv/hwprobe/hwprobe.c | 89 +++++++++++++++++++ .../selftests/riscv/hwprobe/sys_hwprobe.S | 12 +++ tools/testing/selftests/riscv/libc.S | 46 ++++++++++ 6 files changed, 216 insertions(+) create mode 100644 tools/testing/selftests/riscv/Makefile create mode 100644 tools/testing/selftests/riscv/hwprobe/Makefile create mode 100644 tools/testing/selftests/riscv/hwprobe/hwprobe.c create mode 100644 tools/testing/selftests/riscv/hwprobe/sys_hwprobe.S create mode 100644 tools/testing/selftests/riscv/libc.S diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 41b649452560..a599ef726310 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -62,6 +62,7 @@ TARGETS += pstore TARGETS += ptrace TARGETS += openat2 TARGETS += resctrl +TARGETS += riscv TARGETS += rlimits TARGETS += rseq TARGETS += rtc diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile new file mode 100644 index 000000000000..32a72902d045 --- /dev/null +++ b/tools/testing/selftests/riscv/Makefile @@ -0,0 +1,58 @@ +# SPDX-License-Identifier: GPL-2.0 +# Originally tools/testing/arm64/Makefile + +# When ARCH not overridden for crosscompiling, lookup machine +ARCH ?= $(shell uname -m 2>/dev/null || echo not) + +ifneq (,$(filter $(ARCH),riscv)) +RISCV_SUBTARGETS ?= hwprobe +else +RISCV_SUBTARGETS := +endif + +CFLAGS := -Wall -O2 -g + +# A proper top_srcdir is needed by KSFT(lib.mk) +top_srcdir = $(realpath ../../../../) + +# Additional include paths needed by kselftest.h and local headers +CFLAGS += -I$(top_srcdir)/tools/testing/selftests/ + +CFLAGS += $(KHDR_INCLUDES) + +export CFLAGS +export top_srcdir + +all: + @for DIR in $(RISCV_SUBTARGETS); do \ + BUILD_TARGET=$(OUTPUT)/$$DIR; \ + mkdir -p $$BUILD_TARGET; \ + $(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + done + +install: all + @for DIR in $(RISCV_SUBTARGETS); do \ + BUILD_TARGET=$(OUTPUT)/$$DIR; \ + $(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + done + +run_tests: all + @for DIR in $(RISCV_SUBTARGETS); do \ + BUILD_TARGET=$(OUTPUT)/$$DIR; \ + $(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + done + +# Avoid any output on non riscv on emit_tests +emit_tests: all + @for DIR in $(RISCV_SUBTARGETS); do \ + BUILD_TARGET=$(OUTPUT)/$$DIR; \ + $(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + done + +clean: + @for DIR in $(RISCV_SUBTARGETS); do \ + BUILD_TARGET=$(OUTPUT)/$$DIR; \ + $(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@; \ + done + +.PHONY: all clean install run_tests emit_tests diff --git a/tools/testing/selftests/riscv/hwprobe/Makefile b/tools/testing/selftests/riscv/hwprobe/Makefile new file mode 100644 index 000000000000..614501584803 --- /dev/null +++ b/tools/testing/selftests/riscv/hwprobe/Makefile @@ -0,0 +1,10 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 ARM Limited +# Originally tools/testing/arm64/abi/Makefile + +TEST_GEN_PROGS := hwprobe + +include ../../lib.mk + +$(OUTPUT)/hwprobe: hwprobe.c ../libc.S sys_hwprobe.S + $(CC) -o$@ $(CFLAGS) $(LDFLAGS) -nostdlib $^ diff --git a/tools/testing/selftests/riscv/hwprobe/hwprobe.c b/tools/testing/selftests/riscv/hwprobe/hwprobe.c new file mode 100644 index 000000000000..ddfb61de2938 --- /dev/null +++ b/tools/testing/selftests/riscv/hwprobe/hwprobe.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include + +/* + * Rather than relying on having a new enough libc to define this, just do it + * ourselves. This way we don't need to be coupled to a new-enough libc to + * contain the call. + */ +long riscv_hwprobe(struct riscv_hwprobe *pairs, long pair_count, + long cpu_count, unsigned long *cpus, unsigned long flags); + +int main(int argc, char **argv) +{ + struct riscv_hwprobe pairs[8]; + unsigned long cpus; + long out; + + /* Fake the CPU_SET ops. */ + cpus = -1; + + /* + * Just run a basic test: pass enough pairs to get up to the base + * behavior, and then check to make sure it's sane. + */ + for (long i = 0; i < 8; i++) + pairs[i].key = i; + out = riscv_hwprobe(pairs, 8, 1, &cpus, 0); + if (out != 0) + return -1; + for (long i = 0; i < 4; ++i) { + /* Fail if the kernel claims not to recognize a base key. */ + if ((i < 4) && (pairs[i].key != i)) + return -2; + + if (pairs[i].key != RISCV_HWPROBE_KEY_BASE_BEHAVIOR) + continue; + + if (pairs[i].value & RISCV_HWPROBE_BASE_BEHAVIOR_IMA) + continue; + + return -3; + } + + /* + * This should also work with a NULL CPU set, but should not work + * with an improperly supplied CPU set. + */ + out = riscv_hwprobe(pairs, 8, 0, 0, 0); + if (out != 0) + return -4; + + out = riscv_hwprobe(pairs, 8, 0, &cpus, 0); + if (out == 0) + return -5; + + out = riscv_hwprobe(pairs, 8, 1, 0, 0); + if (out == 0) + return -6; + + /* + * Check that keys work by providing one that we know exists, and + * checking to make sure the resultig pair is what we asked for. + */ + pairs[0].key = RISCV_HWPROBE_KEY_BASE_BEHAVIOR; + out = riscv_hwprobe(pairs, 1, 1, &cpus, 0); + if (out != 0) + return -7; + if (pairs[0].key != RISCV_HWPROBE_KEY_BASE_BEHAVIOR) + return -8; + + /* + * Check that an unknown key gets overwritten with -1, + * but doesn't block elements after it. + */ + pairs[0].key = 0x5555; + pairs[1].key = 1; + pairs[1].value = 0xAAAA; + out = riscv_hwprobe(pairs, 2, 0, 0, 0); + if (out != 0) + return -9; + + if (pairs[0].key != -1) + return -10; + + if ((pairs[1].key != 1) || (pairs[1].value == 0xAAAA)) + return -11; + + return 0; +} diff --git a/tools/testing/selftests/riscv/hwprobe/sys_hwprobe.S b/tools/testing/selftests/riscv/hwprobe/sys_hwprobe.S new file mode 100644 index 000000000000..ed8d28863b27 --- /dev/null +++ b/tools/testing/selftests/riscv/hwprobe/sys_hwprobe.S @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2022 Rivos, Inc */ + +.text +.global riscv_hwprobe +riscv_hwprobe: + # Put __NR_riscv_hwprobe in the syscall number register, then just shim + # back the kernel's return. This doesn't do any sort of errno + # handling, the caller can deal with it. + li a7, 258 + ecall + ret diff --git a/tools/testing/selftests/riscv/libc.S b/tools/testing/selftests/riscv/libc.S new file mode 100644 index 000000000000..1041bbea9b6b --- /dev/null +++ b/tools/testing/selftests/riscv/libc.S @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2022 Rivos, Inc */ +/* A C library */ + +#if __riscv_xlen == 64 +# define REG_S sd +#else +# define REG_S sw +#endif + +.text +.global _start +_start: +.option push +.option norelax + la gp, __global_pointer$ +.option pop + + la sp, stack + + la t0, heap + la t1, brk + REG_S t0, 0(t1) + + li a0, 0 + li a1, 0 + + call main + + li a7, 93 + ecall + +1: + j 1b + +.data +brk: + .long 0 + +.global heap +heap: +.rep 65536 +.byte 0 +.endr +.global stack +stack: