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=-6.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25182C433DB for ; Tue, 9 Feb 2021 09:42:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6F9264E88 for ; Tue, 9 Feb 2021 09:42:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230365AbhBIJmd (ORCPT ); Tue, 9 Feb 2021 04:42:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:54336 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229799AbhBIJi3 (ORCPT ); Tue, 9 Feb 2021 04:38:29 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id E804D64E27; Tue, 9 Feb 2021 09:37:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612863468; bh=3uhgNxvkQ3DE4szNXNrRNOmM42w+TvFbEvvc39Kp9o8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dnM8UoIu7vjUquwOGgLNI/nFIs7c5cxhJzUlDrEgEcxaM71P1VbXUNr75slYvIvip JxniosSVimGPVVpFt1UW4dNP6DywhSeOr4E8K+/y/jp/U1BlN9NKoE4b81YZyYVsS4 TOZQ8fJ6UIH5YGUd0osrd5uxargdhmbZrAwT4234= Date: Tue, 9 Feb 2021 10:37:45 +0100 From: Greg KH To: Zhou Wang Cc: Andy Lutomirski , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org, Andrew Morton , Alexander Viro , song.bao.hua@hisilicon.com, jgg@ziepe.ca, kevin.tian@intel.com, jean-philippe@linaro.org, eric.auger@redhat.com, liguozhu@hisilicon.com, zhangfei.gao@linaro.org, Sihang Chen Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin Message-ID: References: <1612685884-19514-2-git-send-email-wangzhou1@hisilicon.com> <2e6cf99f-beb6-9bef-1316-5e58fb0aa86e@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2e6cf99f-beb6-9bef-1316-5e58fb0aa86e@hisilicon.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 09, 2021 at 05:17:46PM +0800, Zhou Wang wrote: > On 2021/2/8 6:02, Andy Lutomirski wrote: > > > > > >> On Feb 7, 2021, at 12:31 AM, Zhou Wang wrote: > >> > >> SVA(share virtual address) offers a way for device to share process virtual > >> address space safely, which makes more convenient for user space device > >> driver coding. However, IO page faults may happen when doing DMA > >> operations. As the latency of IO page fault is relatively big, DMA > >> performance will be affected severely when there are IO page faults. > >> From a long term view, DMA performance will be not stable. > >> > >> In high-performance I/O cases, accelerators might want to perform > >> I/O on a memory without IO page faults which can result in dramatically > >> increased latency. Current memory related APIs could not achieve this > >> requirement, e.g. mlock can only avoid memory to swap to backup device, > >> page migration can still trigger IO page fault. > >> > >> Various drivers working under traditional non-SVA mode are using > >> their own specific ioctl to do pin. Such ioctl can be seen in v4l2, > >> gpu, infiniband, media, vfio, etc. Drivers are usually doing dma > >> mapping while doing pin. > >> > >> But, in SVA mode, pin could be a common need which isn't necessarily > >> bound with any drivers, and neither is dma mapping needed by drivers > >> since devices are using the virtual address of CPU. Thus, It is better > >> to introduce a new common syscall for it. > >> > >> This patch leverages the design of userfaultfd and adds mempinfd for pin > >> to avoid messing up mm_struct. A fd will be got by mempinfd, then user > >> space can do pin/unpin pages by ioctls of this fd, all pinned pages under > >> one file will be unpinned in file release process. Like pin page cases in > >> other places, can_do_mlock is used to check permission and input > >> parameters. > > > > > > Can you document what the syscall does? > > Will add related document in Documentation/vm. A manpage is always good, and will be required eventually :) thanks, greg k-h 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E779FC433DB for ; Tue, 9 Feb 2021 09:37:51 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 642D864E85 for ; Tue, 9 Feb 2021 09:37:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 642D864E85 Authentication-Results: mail.kernel.org; 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Tue, 9 Feb 2021 09:37:49 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 554BD87371 for ; Tue, 9 Feb 2021 09:37:49 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vqXN0+PpQ615 for ; Tue, 9 Feb 2021 09:37:48 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by whitealder.osuosl.org (Postfix) with ESMTPS id BE047872B2 for ; Tue, 9 Feb 2021 09:37:48 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id E804D64E27; Tue, 9 Feb 2021 09:37:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612863468; bh=3uhgNxvkQ3DE4szNXNrRNOmM42w+TvFbEvvc39Kp9o8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=dnM8UoIu7vjUquwOGgLNI/nFIs7c5cxhJzUlDrEgEcxaM71P1VbXUNr75slYvIvip JxniosSVimGPVVpFt1UW4dNP6DywhSeOr4E8K+/y/jp/U1BlN9NKoE4b81YZyYVsS4 TOZQ8fJ6UIH5YGUd0osrd5uxargdhmbZrAwT4234= Date: Tue, 9 Feb 2021 10:37:45 +0100 From: Greg KH To: Zhou Wang Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin Message-ID: References: <1612685884-19514-2-git-send-email-wangzhou1@hisilicon.com> <2e6cf99f-beb6-9bef-1316-5e58fb0aa86e@hisilicon.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2e6cf99f-beb6-9bef-1316-5e58fb0aa86e@hisilicon.com> Cc: jean-philippe@linaro.org, kevin.tian@intel.com, Sihang Chen , jgg@ziepe.ca, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Lutomirski , linux-mm@kvack.org, iommu@lists.linux-foundation.org, Alexander Viro , zhangfei.gao@linaro.org, Andrew Morton , liguozhu@hisilicon.com, linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBGZWIgMDksIDIwMjEgYXQgMDU6MTc6NDZQTSArMDgwMCwgWmhvdSBXYW5nIHdyb3Rl Ogo+IE9uIDIwMjEvMi84IDY6MDIsIEFuZHkgTHV0b21pcnNraSB3cm90ZToKPiA+IAo+ID4gCj4g Pj4gT24gRmViIDcsIDIwMjEsIGF0IDEyOjMxIEFNLCBaaG91IFdhbmcgPHdhbmd6aG91MUBoaXNp bGljb24uY29tPiB3cm90ZToKPiA+Pgo+ID4+IO+7v1NWQShzaGFyZSB2aXJ0dWFsIGFkZHJlc3Mp IG9mZmVycyBhIHdheSBmb3IgZGV2aWNlIHRvIHNoYXJlIHByb2Nlc3MgdmlydHVhbAo+ID4+IGFk ZHJlc3Mgc3BhY2Ugc2FmZWx5LCB3aGljaCBtYWtlcyBtb3JlIGNvbnZlbmllbnQgZm9yIHVzZXIg c3BhY2UgZGV2aWNlCj4gPj4gZHJpdmVyIGNvZGluZy4gSG93ZXZlciwgSU8gcGFnZSBmYXVsdHMg bWF5IGhhcHBlbiB3aGVuIGRvaW5nIERNQQo+ID4+IG9wZXJhdGlvbnMuIEFzIHRoZSBsYXRlbmN5 IG9mIElPIHBhZ2UgZmF1bHQgaXMgcmVsYXRpdmVseSBiaWcsIERNQQo+ID4+IHBlcmZvcm1hbmNl IHdpbGwgYmUgYWZmZWN0ZWQgc2V2ZXJlbHkgd2hlbiB0aGVyZSBhcmUgSU8gcGFnZSBmYXVsdHMu Cj4gPj4gRnJvbSBhIGxvbmcgdGVybSB2aWV3LCBETUEgcGVyZm9ybWFuY2Ugd2lsbCBiZSBub3Qg c3RhYmxlLgo+ID4+Cj4gPj4gSW4gaGlnaC1wZXJmb3JtYW5jZSBJL08gY2FzZXMsIGFjY2VsZXJh dG9ycyBtaWdodCB3YW50IHRvIHBlcmZvcm0KPiA+PiBJL08gb24gYSBtZW1vcnkgd2l0aG91dCBJ TyBwYWdlIGZhdWx0cyB3aGljaCBjYW4gcmVzdWx0IGluIGRyYW1hdGljYWxseQo+ID4+IGluY3Jl YXNlZCBsYXRlbmN5LiBDdXJyZW50IG1lbW9yeSByZWxhdGVkIEFQSXMgY291bGQgbm90IGFjaGll dmUgdGhpcwo+ID4+IHJlcXVpcmVtZW50LCBlLmcuIG1sb2NrIGNhbiBvbmx5IGF2b2lkIG1lbW9y eSB0byBzd2FwIHRvIGJhY2t1cCBkZXZpY2UsCj4gPj4gcGFnZSBtaWdyYXRpb24gY2FuIHN0aWxs IHRyaWdnZXIgSU8gcGFnZSBmYXVsdC4KPiA+Pgo+ID4+IFZhcmlvdXMgZHJpdmVycyB3b3JraW5n IHVuZGVyIHRyYWRpdGlvbmFsIG5vbi1TVkEgbW9kZSBhcmUgdXNpbmcKPiA+PiB0aGVpciBvd24g c3BlY2lmaWMgaW9jdGwgdG8gZG8gcGluLiBTdWNoIGlvY3RsIGNhbiBiZSBzZWVuIGluIHY0bDIs Cj4gPj4gZ3B1LCBpbmZpbmliYW5kLCBtZWRpYSwgdmZpbywgZXRjLiBEcml2ZXJzIGFyZSB1c3Vh bGx5IGRvaW5nIGRtYQo+ID4+IG1hcHBpbmcgd2hpbGUgZG9pbmcgcGluLgo+ID4+Cj4gPj4gQnV0 LCBpbiBTVkEgbW9kZSwgcGluIGNvdWxkIGJlIGEgY29tbW9uIG5lZWQgd2hpY2ggaXNuJ3QgbmVj ZXNzYXJpbHkKPiA+PiBib3VuZCB3aXRoIGFueSBkcml2ZXJzLCBhbmQgbmVpdGhlciBpcyBkbWEg bWFwcGluZyBuZWVkZWQgYnkgZHJpdmVycwo+ID4+IHNpbmNlIGRldmljZXMgYXJlIHVzaW5nIHRo ZSB2aXJ0dWFsIGFkZHJlc3Mgb2YgQ1BVLiBUaHVzLCBJdCBpcyBiZXR0ZXIKPiA+PiB0byBpbnRy b2R1Y2UgYSBuZXcgY29tbW9uIHN5c2NhbGwgZm9yIGl0Lgo+ID4+Cj4gPj4gVGhpcyBwYXRjaCBs ZXZlcmFnZXMgdGhlIGRlc2lnbiBvZiB1c2VyZmF1bHRmZCBhbmQgYWRkcyBtZW1waW5mZCBmb3Ig cGluCj4gPj4gdG8gYXZvaWQgbWVzc2luZyB1cCBtbV9zdHJ1Y3QuIEEgZmQgd2lsbCBiZSBnb3Qg YnkgbWVtcGluZmQsIHRoZW4gdXNlcgo+ID4+IHNwYWNlIGNhbiBkbyBwaW4vdW5waW4gcGFnZXMg YnkgaW9jdGxzIG9mIHRoaXMgZmQsIGFsbCBwaW5uZWQgcGFnZXMgdW5kZXIKPiA+PiBvbmUgZmls ZSB3aWxsIGJlIHVucGlubmVkIGluIGZpbGUgcmVsZWFzZSBwcm9jZXNzLiBMaWtlIHBpbiBwYWdl IGNhc2VzIGluCj4gPj4gb3RoZXIgcGxhY2VzLCBjYW5fZG9fbWxvY2sgaXMgdXNlZCB0byBjaGVj ayBwZXJtaXNzaW9uIGFuZCBpbnB1dAo+ID4+IHBhcmFtZXRlcnMuCj4gPiAKPiA+IAo+ID4gQ2Fu IHlvdSBkb2N1bWVudCB3aGF0IHRoZSBzeXNjYWxsIGRvZXM/Cj4gCj4gV2lsbCBhZGQgcmVsYXRl ZCBkb2N1bWVudCBpbiBEb2N1bWVudGF0aW9uL3ZtLgoKQSBtYW5wYWdlIGlzIGFsd2F5cyBnb29k LCBhbmQgd2lsbCBiZSByZXF1aXJlZCBldmVudHVhbGx5IDopCgp0aGFua3MsCgpncmVnIGstaAoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJt LWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtl cm5lbAo=