From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by aws-us-west-2-korg-lkml-1.web.codeaurora.org (Postfix) with ESMTP id 67150C433EF for ; Thu, 14 Jun 2018 16:09:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1E292208DA for ; Thu, 14 Jun 2018 16:09:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1E292208DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755413AbeFNQJF (ORCPT ); Thu, 14 Jun 2018 12:09:05 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:21353 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755069AbeFNQJB (ORCPT ); Thu, 14 Jun 2018 12:09:01 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w5EG8v24079429 for ; Thu, 14 Jun 2018 12:09:01 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0b-001b2d01.pphosted.com with ESMTP id 2jkrxy9327-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 14 Jun 2018 12:08:58 -0400 Received: from localhost by e06smtp01.uk.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) Thu, 14 Jun 2018 17:06:59 +0100 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w5EG6xjX27656418 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 14 Jun 2018 16:06:59 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 110B911C054; Thu, 14 Jun 2018 16:57:32 +0100 (BST) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 82D8411C050; Thu, 14 Jun 2018 16:57:30 +0100 (BST) Received: from [9.164.160.4] (unknown [9.164.160.4]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 14 Jun 2018 16:57:30 +0100 (BST) Subject: Re: [PATCH] misc: ocxl: Change return type for fault handler To: Souptick Joarder , willy@infradead.org, fbarrat@linux.vnet.ibm.com, andrew.donnellan@au1.ibm.com, arnd@arndb.de, gregkh@linuxfoundation.org Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, sabyasachi.linux@gmail.com, brajeswar.linux@gmail.com References: <20180611202904.GA25538@jordon-HP-15-Notebook-PC> From: Frederic Barrat Date: Thu, 14 Jun 2018 18:06:56 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180611202904.GA25538@jordon-HP-15-Notebook-PC> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 18061416-4275-0000-0000-0000028DC763 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18061416-4276-0000-0000-00003794F772 Message-Id: <5c6942da-c847-c53a-a571-4ec96f2a993d@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-14_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1805220000 definitions=main-1806140176 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 11/06/2018 à 22:29, Souptick Joarder a écrit : > Use new return type vm_fault_t for fault handler. For > now, this is just documenting that the function returns > a VM_FAULT value rather than an errno. Once all instances > are converted, vm_fault_t will become a distinct type. > > Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t") > > There is an existing bug when vm_insert_pfn() can return > ENOMEM which was ignored and VM_FAULT_NOPAGE returned as > default. The new inline vmf_insert_pfn() has removed > this inefficiency by returning correct vm_fault_ type. > > Signed-off-by: Souptick Joarder > --- Thanks! Tested and Acked-by: Frederic Barrat > drivers/misc/ocxl/context.c | 22 +++++++++++----------- > drivers/misc/ocxl/sysfs.c | 5 ++--- > 2 files changed, 13 insertions(+), 14 deletions(-) > > diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c > index 909e880..98daf91 100644 > --- a/drivers/misc/ocxl/context.c > +++ b/drivers/misc/ocxl/context.c > @@ -83,7 +83,7 @@ int ocxl_context_attach(struct ocxl_context *ctx, u64 amr) > return rc; > } > > -static int map_afu_irq(struct vm_area_struct *vma, unsigned long address, > +static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address, > u64 offset, struct ocxl_context *ctx) > { > u64 trigger_addr; > @@ -92,15 +92,15 @@ static int map_afu_irq(struct vm_area_struct *vma, unsigned long address, > if (!trigger_addr) > return VM_FAULT_SIGBUS; > > - vm_insert_pfn(vma, address, trigger_addr >> PAGE_SHIFT); > - return VM_FAULT_NOPAGE; > + return vmf_insert_pfn(vma, address, trigger_addr >> PAGE_SHIFT); > } > > -static int map_pp_mmio(struct vm_area_struct *vma, unsigned long address, > +static vm_fault_t map_pp_mmio(struct vm_area_struct *vma, unsigned long address, > u64 offset, struct ocxl_context *ctx) > { > u64 pp_mmio_addr; > int pasid_off; > + vm_fault_t ret; > > if (offset >= ctx->afu->config.pp_mmio_stride) > return VM_FAULT_SIGBUS; > @@ -118,27 +118,27 @@ static int map_pp_mmio(struct vm_area_struct *vma, unsigned long address, > pasid_off * ctx->afu->config.pp_mmio_stride + > offset; > > - vm_insert_pfn(vma, address, pp_mmio_addr >> PAGE_SHIFT); > + ret = vmf_insert_pfn(vma, address, pp_mmio_addr >> PAGE_SHIFT); > mutex_unlock(&ctx->status_mutex); > - return VM_FAULT_NOPAGE; > + return ret; > } > > -static int ocxl_mmap_fault(struct vm_fault *vmf) > +static vm_fault_t ocxl_mmap_fault(struct vm_fault *vmf) > { > struct vm_area_struct *vma = vmf->vma; > struct ocxl_context *ctx = vma->vm_file->private_data; > u64 offset; > - int rc; > + vm_fault_t ret; > > offset = vmf->pgoff << PAGE_SHIFT; > pr_debug("%s: pasid %d address 0x%lx offset 0x%llx\n", __func__, > ctx->pasid, vmf->address, offset); > > if (offset < ctx->afu->irq_base_offset) > - rc = map_pp_mmio(vma, vmf->address, offset, ctx); > + ret = map_pp_mmio(vma, vmf->address, offset, ctx); > else > - rc = map_afu_irq(vma, vmf->address, offset, ctx); > - return rc; > + ret = map_afu_irq(vma, vmf->address, offset, ctx); > + return ret; > } > > static const struct vm_operations_struct ocxl_vmops = { > diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c > index d9753a1..0ab1fd1 100644 > --- a/drivers/misc/ocxl/sysfs.c > +++ b/drivers/misc/ocxl/sysfs.c > @@ -64,7 +64,7 @@ static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj, > return count; > } > > -static int global_mmio_fault(struct vm_fault *vmf) > +static vm_fault_t global_mmio_fault(struct vm_fault *vmf) > { > struct vm_area_struct *vma = vmf->vma; > struct ocxl_afu *afu = vma->vm_private_data; > @@ -75,8 +75,7 @@ static int global_mmio_fault(struct vm_fault *vmf) > > offset = vmf->pgoff; > offset += (afu->global_mmio_start >> PAGE_SHIFT); > - vm_insert_pfn(vma, vmf->address, offset); > - return VM_FAULT_NOPAGE; > + return vmf_insert_pfn(vma, vmf->address, offset); > } > > static const struct vm_operations_struct global_mmio_vmops = { >