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=-3.8 required=3.0 tests=BAYES_00, 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 DB3C2C388F9 for ; Wed, 11 Nov 2020 09:42:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CC9320756 for ; Wed, 11 Nov 2020 09:42:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726455AbgKKJmw (ORCPT ); Wed, 11 Nov 2020 04:42:52 -0500 Received: from szxga01-in.huawei.com ([45.249.212.187]:2060 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725830AbgKKJms (ORCPT ); Wed, 11 Nov 2020 04:42:48 -0500 Received: from dggeme758-chm.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4CWKX06cr2zVmv9; Wed, 11 Nov 2020 17:42:24 +0800 (CST) Received: from dggemi761-chm.china.huawei.com (10.1.198.147) by dggeme758-chm.china.huawei.com (10.3.19.104) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Wed, 11 Nov 2020 17:42:42 +0800 Received: from dggemi761-chm.china.huawei.com ([10.9.49.202]) by dggemi761-chm.china.huawei.com ([10.9.49.202]) with mapi id 15.01.1913.007; Wed, 11 Nov 2020 17:42:42 +0800 From: "Song Bao Hua (Barry Song)" To: John Garry , "iommu@lists.linux-foundation.org" , "hch@lst.de" , "robin.murphy@arm.com" , "m.szyprowski@samsung.com" CC: "linux-kselftest@vger.kernel.org" , "Will Deacon" , Joerg Roedel , Linuxarm , "xuwei (O)" , Shuah Khan Subject: RE: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs Thread-Topic: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs Thread-Index: AQHWsO+tiT3rvc8AvUKektYgWKvLn6nBDT6Q//+EgQCAAZyYMIAABiqAgACFcyA= Date: Wed, 11 Nov 2020 09:42:42 +0000 Message-ID: References: <20201102080646.2180-1-song.bao.hua@hisilicon.com> <20201102080646.2180-2-song.bao.hua@hisilicon.com> <0658ee16-d539-61c5-1d39-77d50f559803@huawei.com> <88e91063b7f041bda7d147438f1c4621@hisilicon.com> <51f0c148-e2e3-e084-4021-ec5883919436@huawei.com> In-Reply-To: <51f0c148-e2e3-e084-4021-ec5883919436@huawei.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.126.200.81] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org DQoNCj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogSm9obiBHYXJyeQ0KPiBT ZW50OiBXZWRuZXNkYXksIE5vdmVtYmVyIDExLCAyMDIwIDEwOjM3IFBNDQo+IFRvOiBTb25nIEJh byBIdWEgKEJhcnJ5IFNvbmcpIDxzb25nLmJhby5odWFAaGlzaWxpY29uLmNvbT47DQo+IGlvbW11 QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnOyBoY2hAbHN0LmRlOyByb2Jpbi5tdXJwaHlAYXJt LmNvbTsNCj4gbS5zenlwcm93c2tpQHNhbXN1bmcuY29tDQo+IENjOiBsaW51eC1rc2VsZnRlc3RA dmdlci5rZXJuZWwub3JnOyBXaWxsIERlYWNvbiA8d2lsbEBrZXJuZWwub3JnPjsgSm9lcmcNCj4g Um9lZGVsIDxqb3JvQDhieXRlcy5vcmc+OyBMaW51eGFybSA8bGludXhhcm1AaHVhd2VpLmNvbT47 IHh1d2VpIChPKQ0KPiA8eHV3ZWk1QGh1YXdlaS5jb20+OyBTaHVhaCBLaGFuIDxzaHVhaEBrZXJu ZWwub3JnPg0KPiBTdWJqZWN0OiBSZTogW1BBVENIIHYzIDEvMl0gZG1hLW1hcHBpbmc6IGFkZCBi ZW5jaG1hcmsgc3VwcG9ydCBmb3INCj4gc3RyZWFtaW5nIERNQSBBUElzDQo+IA0KPiBPbiAxMS8x MS8yMDIwIDAxOjI5LCBTb25nIEJhbyBIdWEgKEJhcnJ5IFNvbmcpIHdyb3RlOg0KPiA+IEknZCBs aWtlIHRvIHRoaW5rIGNoZWNraW5nIHRoaXMgaGVyZSB3b3VsZCBiZSBvdmVyZGVzaWduLiBXZSBq dXN0IGdpdmUgdXNlcnMgdGhlDQo+ID4gZnJlZWRvbSB0byBiaW5kIGFueSBkZXZpY2UgdGhleSBj YXJlIGFib3V0IHRvIHRoZSBiZW5jaG1hcmsgZHJpdmVyLiBVc3VhbGx5DQo+ID4gdGhhdCBtZWFu cyBhIHJlYWwgaGFyZHdhcmUgZWl0aGVyIGJlaGluZCBhbiBJT01NVSBvciB0aHJvdWdoIGEgZGly ZWN0DQo+ID4gbWFwcGluZy4NCj4gPg0KPiA+IGlmIGZvciBhbnkgcmVhc29uIHVzZXJzIHB1dCBh IHdyb25nICJkZXZpY2UiLCB0aGF0IGlzIHRoZSBjaG9pY2Ugb2YgdXNlcnMuDQo+IA0KPiBSaWdo dCwgYnV0IGlmIHRoZSBkZXZpY2Ugc2ltcGx5IGhhcyBubyBETUEgb3BzIHN1cHBvcnRlZCwgaXQg Y291bGQgYmUNCj4gYmV0dGVyIHRvIGZhaWwgdGhlIHByb2JlIHJhdGhlciB0aGFuIGxldCB0aGVt IHRyeSB0aGUgdGVzdCBhdCBhbGwuDQo+IA0KPiAgIEFueWhvdywNCj4gPiB0aGUgYmVsb3cgY29k ZSB3aWxsIHN0aWxsIGhhbmRsZSBpdCBwcm9wZXJseSBhbmQgdXNlcnMgd2lsbCBnZXQgYSByZXBv cnQgaW4gd2hpY2gNCj4gPiBldmVyeXRoaW5nIGlzIHplcm8uDQo+ID4NCj4gPiArc3RhdGljIGlu dCBtYXBfYmVuY2htYXJrX3RocmVhZCh2b2lkICpkYXRhKQ0KPiA+ICt7DQo+ID4gLi4uDQo+ID4g KwkJZG1hX2FkZHIgPSBkbWFfbWFwX3NpbmdsZShtYXAtPmRldiwgYnVmLCBQQUdFX1NJWkUsDQo+ IERNQV9CSURJUkVDVElPTkFMKTsNCj4gPiArCQlpZiAodW5saWtlbHkoZG1hX21hcHBpbmdfZXJy b3IobWFwLT5kZXYsIGRtYV9hZGRyKSkpIHsNCj4gDQo+IERvaW5nIHRoaXMgaXMgcHJvcGVyLCBi dXQgSSBhbSBub3Qgc3VyZSBpZiB0aGlzIHRlbGxzIHRoZSB1c2VyIHRoZSByZWFsDQo+IHByb2Js ZW0uDQoNClRlbGxpbmcgdXNlcnMgdGhlIHJlYWwgcHJvYmxlbSBpc24ndCB0aGUgZGVzaWduIGlu dGVudGlvbiBvZiB0aGlzIHRlc3QNCmJlbmNobWFyay4gSXQgaXMgbmV2ZXIgdGhlIHB1cnBvc2Ug b2YgdGhpcyBiZW5jaG1hcmsuDQoNCj4gDQo+ID4gKwkJCXByX2VycigiZG1hX21hcF9zaW5nbGUg ZmFpbGVkIG9uICVzXG4iLA0KPiBkZXZfbmFtZShtYXAtPmRldikpOw0KPiANCj4gTm90IHN1cmUg d2h5IHVzZSBwcl9lcnIoKSBvdmVyIGRldl9lcnIoKS4NCg0KV2UgYXJlIHJlcG9ydGluZyBlcnJv cnMgaW4gZG1hLWJlbmNobWFyayBkcml2ZXIgcmF0aGVyIHRoYW4gcmVwb3J0aW5nIGVycm9ycw0K aW4gdGhlIGRyaXZlciBvZiB0aGUgc3BlY2lmaWMgZGV2aWNlLiBJIHRoaW5rIHdlIHNob3VsZCBo YXZlICJkbWEtYmVuY2htYXJrIg0KYXMgdGhlIHByZWZpeCB3aGlsZSBwcmludGluZyB0aGUgbmFt ZSBvZiB0aGUgZGV2aWNlIGJ5IGRldl9uYW1lKCkuDQoNCj4gDQo+ID4gKwkJCXJldCA9IC1FTk9N RU07DQo+ID4gKwkJCWdvdG8gb3V0Ow0KPiA+ICsJCX0NCj4gDQo+IFRoYW5rcywNCj4gSm9obg0K DQpUaGFua3MNCkJhcnJ5DQoNCg== 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=-3.8 required=3.0 tests=BAYES_00, 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 81A82C56201 for ; Wed, 11 Nov 2020 09:42:54 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 B9FDE20756 for ; Wed, 11 Nov 2020 09:42:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B9FDE20756 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=hisilicon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 190EA867E3; Wed, 11 Nov 2020 09:42:53 +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 bjYo0CrqtPfr; Wed, 11 Nov 2020 09:42:51 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id C8B778328C; Wed, 11 Nov 2020 09:42:51 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id AD8DFC0889; Wed, 11 Nov 2020 09:42:51 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id BD38CC016F for ; Wed, 11 Nov 2020 09:42:50 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id AC11E86360 for ; Wed, 11 Nov 2020 09:42:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oE9KEBbBcmw3 for ; Wed, 11 Nov 2020 09:42:49 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by fraxinus.osuosl.org (Postfix) with ESMTPS id C8D308621E for ; Wed, 11 Nov 2020 09:42:48 +0000 (UTC) Received: from dggeme758-chm.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4CWKX06cr2zVmv9; Wed, 11 Nov 2020 17:42:24 +0800 (CST) Received: from dggemi761-chm.china.huawei.com (10.1.198.147) by dggeme758-chm.china.huawei.com (10.3.19.104) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Wed, 11 Nov 2020 17:42:42 +0800 Received: from dggemi761-chm.china.huawei.com ([10.9.49.202]) by dggemi761-chm.china.huawei.com ([10.9.49.202]) with mapi id 15.01.1913.007; Wed, 11 Nov 2020 17:42:42 +0800 From: "Song Bao Hua (Barry Song)" To: John Garry , "iommu@lists.linux-foundation.org" , "hch@lst.de" , "robin.murphy@arm.com" , "m.szyprowski@samsung.com" Subject: RE: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs Thread-Topic: [PATCH v3 1/2] dma-mapping: add benchmark support for streaming DMA APIs Thread-Index: AQHWsO+tiT3rvc8AvUKektYgWKvLn6nBDT6Q//+EgQCAAZyYMIAABiqAgACFcyA= Date: Wed, 11 Nov 2020 09:42:42 +0000 Message-ID: References: <20201102080646.2180-1-song.bao.hua@hisilicon.com> <20201102080646.2180-2-song.bao.hua@hisilicon.com> <0658ee16-d539-61c5-1d39-77d50f559803@huawei.com> <88e91063b7f041bda7d147438f1c4621@hisilicon.com> <51f0c148-e2e3-e084-4021-ec5883919436@huawei.com> In-Reply-To: <51f0c148-e2e3-e084-4021-ec5883919436@huawei.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.126.200.81] MIME-Version: 1.0 X-CFilter-Loop: Reflected Cc: "linux-kselftest@vger.kernel.org" , Will Deacon , Linuxarm , "xuwei \(O\)" , Shuah Khan 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; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > -----Original Message----- > From: John Garry > Sent: Wednesday, November 11, 2020 10:37 PM > To: Song Bao Hua (Barry Song) ; > iommu@lists.linux-foundation.org; hch@lst.de; robin.murphy@arm.com; > m.szyprowski@samsung.com > Cc: linux-kselftest@vger.kernel.org; Will Deacon ; Joerg > Roedel ; Linuxarm ; xuwei (O) > ; Shuah Khan > Subject: Re: [PATCH v3 1/2] dma-mapping: add benchmark support for > streaming DMA APIs > > On 11/11/2020 01:29, Song Bao Hua (Barry Song) wrote: > > I'd like to think checking this here would be overdesign. We just give users the > > freedom to bind any device they care about to the benchmark driver. Usually > > that means a real hardware either behind an IOMMU or through a direct > > mapping. > > > > if for any reason users put a wrong "device", that is the choice of users. > > Right, but if the device simply has no DMA ops supported, it could be > better to fail the probe rather than let them try the test at all. > > Anyhow, > > the below code will still handle it properly and users will get a report in which > > everything is zero. > > > > +static int map_benchmark_thread(void *data) > > +{ > > ... > > + dma_addr = dma_map_single(map->dev, buf, PAGE_SIZE, > DMA_BIDIRECTIONAL); > > + if (unlikely(dma_mapping_error(map->dev, dma_addr))) { > > Doing this is proper, but I am not sure if this tells the user the real > problem. Telling users the real problem isn't the design intention of this test benchmark. It is never the purpose of this benchmark. > > > + pr_err("dma_map_single failed on %s\n", > dev_name(map->dev)); > > Not sure why use pr_err() over dev_err(). We are reporting errors in dma-benchmark driver rather than reporting errors in the driver of the specific device. I think we should have "dma-benchmark" as the prefix while printing the name of the device by dev_name(). > > > + ret = -ENOMEM; > > + goto out; > > + } > > Thanks, > John Thanks Barry _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu