From patchwork Wed Sep 12 19:40:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Breno Leitao X-Patchwork-Id: 969180 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 ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 429XWM2Kr4z9s3x for ; Thu, 13 Sep 2018 05:52:47 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=debian.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 429XWM0wfPzF37X for ; Thu, 13 Sep 2018 05:52:47 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=debian.org X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=debian.org (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=leitao@debian.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=debian.org Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 429XFY0mwpzF3Cq for ; Thu, 13 Sep 2018 05:40:48 +1000 (AEST) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w8CJYZZW105689 for ; Wed, 12 Sep 2018 15:40:46 -0400 Received: from e31.co.us.ibm.com (e31.co.us.ibm.com [32.97.110.149]) by mx0a-001b2d01.pphosted.com with ESMTP id 2mf7btmhnn-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 12 Sep 2018 15:40:46 -0400 Received: from localhost by e31.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 12 Sep 2018 13:40:42 -0600 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w8CJefCi24838166 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 12 Sep 2018 12:40:41 -0700 Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D66DA78068; Wed, 12 Sep 2018 13:40:41 -0600 (MDT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9824278063; Wed, 12 Sep 2018 13:40:39 -0600 (MDT) Received: from debra.ibm.com (unknown [9.85.149.11]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 12 Sep 2018 13:40:39 -0600 (MDT) From: Breno Leitao To: linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 05/11] powerpc/tm: Function that updates the failure code Date: Wed, 12 Sep 2018 16:40:13 -0300 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1536781219-13938-1-git-send-email-leitao@debian.org> References: <1536781219-13938-1-git-send-email-leitao@debian.org> X-TM-AS-GCONF: 00 x-cbid: 18091219-8235-0000-0000-00000DFE3074 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009709; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01087370; UDB=6.00561487; IPR=6.00867382; MB=3.00023256; MTD=3.00000008; XFM=3.00000015; UTC=2018-09-12 19:40:44 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18091219-8236-0000-0000-0000429E4E84 Message-Id: <1536781219-13938-6-git-send-email-leitao@debian.org> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-09-12_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=237 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1809120195 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mikey@neuling.org, gromero@linux.vnet.ibm.com, Breno Leitao , ldufour@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Now the transaction reclaims happens very earlier in the trap handler, and it is impossible to know precisely, at that early time, what should be set as the failure cause for some specific cases, as, if the task will be rescheduled, thus, the transaction abort case should be updated from TM_CAUSE_MISC to TM_CAUSE_RESCHED, for example. This patch creates a function that will update TEXASR special purpose register in the task thread and set the failure code which will be moved to the live register afterward. Signed-off-by: Breno Leitao --- arch/powerpc/kernel/process.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 54fddf03b97a..fe063c0142e3 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -85,6 +85,7 @@ extern unsigned long _get_SP(void); * other paths that we should never reach with suspend disabled. */ bool tm_suspend_disabled __ro_after_init = false; +static void tm_fix_failure_cause(struct task_struct *task, uint8_t cause); static void check_if_tm_restore_required(struct task_struct *tsk) { @@ -988,6 +989,14 @@ void tm_recheckpoint(struct thread_struct *thread) local_irq_restore(flags); } +/* Change thread->tm.texasr failure code */ +static void tm_fix_failure_cause(struct task_struct *task, uint8_t cause) +{ + /* Clear the cause first */ + task->thread.tm_texasr &= ~TEXASR_FC; + task->thread.tm_texasr |= (unsigned long) cause << 56; +} + static inline void tm_recheckpoint_new_task(struct task_struct *new) { if (!cpu_has_feature(CPU_FTR_TM))