From patchwork Wed Dec 2 00:02:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rashmica Gupta X-Patchwork-Id: 551092 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id ABA51140273 for ; Wed, 2 Dec 2015 11:04:23 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=lpGMP4nV; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 832131A0CAE for ; Wed, 2 Dec 2015 11:04:23 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=lpGMP4nV; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from mail-pa0-x229.google.com (mail-pa0-x229.google.com [IPv6:2607:f8b0:400e:c03::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id EABD11A0BC8 for ; Wed, 2 Dec 2015 11:03:02 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=lpGMP4nV; dkim-atps=neutral Received: by padhx2 with SMTP id hx2so20843770pad.1 for ; Tue, 01 Dec 2015 16:03:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:date:message-id; bh=2+GzzMnbYRP0jeW/gWlcpB1vlMtV6Hwj3qI9NyFsnWg=; b=lpGMP4nVD0106//SE7axkbDS8TFzVZINlx+AvM6QIEApraPdHoDMOoJWHyHdoMgkl5 1ChH+vP8GIEBCmL+3mbx1IpPcFFQbkEQDcS9ty9rfWaake7mwQ8QYZylsmm32c9y7iGr MfN7krMOYrY2jSytdIP5SwoqJX2QVW5D1+Iqzr0wWnqA06SVP6qejLESaTfriu9ZuR/Y KGxk24+7pOt9rJE6jDzJ/rHdTkh868WGMUp+/ZI/c/TC5tvDflieK+vH2QYjtPSO/MaI v9kaln+i7/Mu9s0JwOI/eu76n7xPeH5zDh0el+IeUXDdaE7GMCaPrZLEjHpcSBz7Wog9 ujBg== X-Received: by 10.98.12.20 with SMTP id u20mr249168pfi.71.1449014580867; Tue, 01 Dec 2015 16:03:00 -0800 (PST) Received: from circle.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id jj5sm200814pac.4.2015.12.01.16.02.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 01 Dec 2015 16:03:00 -0800 (PST) From: Rashmica Gupta To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] selftests/powerpc: Add test to check is DSCR is corrupted. Date: Wed, 2 Dec 2015 11:02:49 +1100 Message-Id: <1449014569-4403-1-git-send-email-rashmicy@gmail.com> X-Mailer: git-send-email 2.5.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" If the transaction is aborted, the DSCR should be rolled back to the checkpointed value before the transaction began. Signed-off-by: Rashmica Gupta --- To check this yourself, undo the changes from the patch "powerpc/tm: Fix context switching TAR, PPR and DSCR SPRs". tools/testing/selftests/powerpc/tm/.gitignore | 1 + tools/testing/selftests/powerpc/tm/Makefile | 2 +- tools/testing/selftests/powerpc/tm/tm-dscr.c | 91 +++++++++++++++++++++++++++ 3 files changed, 93 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/tm/tm-dscr.c diff --git a/tools/testing/selftests/powerpc/tm/.gitignore b/tools/testing/selftests/powerpc/tm/.gitignore index d0c7c97e9b13..76eae258feeb 100644 --- a/tools/testing/selftests/powerpc/tm/.gitignore +++ b/tools/testing/selftests/powerpc/tm/.gitignore @@ -3,3 +3,4 @@ tm-syscall tm-signal-msr-resv tm-signal-stack tm-fork +tm-dscr diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile index f7d4727662aa..59eec240339d 100644 --- a/tools/testing/selftests/powerpc/tm/Makefile +++ b/tools/testing/selftests/powerpc/tm/Makefile @@ -1,4 +1,4 @@ -TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-fork +TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-fork tm-dscr all: $(TEST_PROGS) diff --git a/tools/testing/selftests/powerpc/tm/tm-dscr.c b/tools/testing/selftests/powerpc/tm/tm-dscr.c new file mode 100644 index 000000000000..ac44e259c86d --- /dev/null +++ b/tools/testing/selftests/powerpc/tm/tm-dscr.c @@ -0,0 +1,91 @@ +/* + * Copyright 2015, Michael Neuling, IBM Corp. + * Licensed under GPLv2. + * Original: Michael Neuling 19/7/2013 + * Edited: Rashmica Gupta 01/12/2015 + * + * Do some transactions, see if the dscr is corrupted. + * + */ + +#include +#include +#include +#include + +#include "tm.h" +#include "utils.h" + +#define SPRN_DSCR 0x3 + +int num_loops = 10000; + +int test_dscr(void) +{ + int i; + + SKIP_IF(!have_htm()); + + for (i = 0; i < num_loops; i++) + { + uint64_t result = 0; + asm __volatile__( + "li 7, 1;" + "mtspr %[dscr], 7;" // dscr = 1 + "tbegin.;" + "beq 3f ;" + "li 4, 0x7000;" // Loop lots, to use time + "2: ;" // Start loop + "li 7, 2;" + "mtspr %[dscr], 7;" // dscr = 2 + "tsuspend.;" + "li 7, 3;" + "mtspr %[dscr], 7;" // dscr = 3 + "tresume.;" + "subi 4, 4, 1;" + "cmpdi 4, 0;" + "bne 2b;" + "tend.;" + + // Transaction sucess! DSCR should be 3. + "mfspr 7, %[dscr];" + "ori %[res], 7, 4;" // res = 3|4 = 7 + "b 4f;" + + // Abort handler. DSCR should be rolled back to 1. + "3:;" + "mfspr 7, %[dscr];" + "ori %[res], 7, 8;" // res = 1|8 = 9 + "4:;" + + : [res]"=r"(result) + : [dscr]"i"(SPRN_DSCR) + : "memory", "r0", "r4", "r7"); + + // If result is anything else other than 7 or 9, the dscr + // value must have been corrupted. + if ((result != 7) && (result != 9)) + return 1; + + } + return 0; +} + +int main(int argc, char *argv[]) +{ + + // A low number of iterations (eg 100) can cause a false pass. + if (argc > 1) { + if (strcmp(argv[1], "-h") == 0) { + printf("Syntax:\n\t%s []\n", + argv[0]); + return 0; + } else { + num_loops = atoi(argv[1]); + } + } + + printf("Starting, %d loops\n", num_loops); + + test_harness(test_dscr, "tm_dscr"); +}