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spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 2F12CFD8; Mon, 5 Aug 2019 15:56:17 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 330D7F4A for ; Mon, 5 Aug 2019 15:56:16 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [85.220.165.71]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id B97F082D for ; Mon, 5 Aug 2019 15:56:15 +0000 (UTC) Received: from kresse.hi.pengutronix.de ([2001:67c:670:100:1d::2a]) by metis.ext.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1hufLJ-0000cf-EY; Mon, 05 Aug 2019 17:56:13 +0200 Message-ID: <1565020572.2323.15.camel@pengutronix.de> Subject: Re: large DMA segments vs SWIOTLB From: Lucas Stach To: Christoph Hellwig Date: Mon, 05 Aug 2019 17:56:12 +0200 In-Reply-To: <20190801140045.GA23435@lst.de> References: <1564584029.7267.15.camel@pengutronix.de> <20190801072958.GA16178@lst.de> <1564648502.7267.27.camel@pengutronix.de> <20190801140045.GA23435@lst.de> X-Mailer: Evolution 3.22.6-1+deb9u2 Mime-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::2a X-SA-Exim-Mail-From: l.stach@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: iommu@lists.linux-foundation.org Cc: iommu@lists.linux-foundation.org, Konrad Rzeszutek Wilk X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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="utf-8" Content-Transfer-Encoding: base64 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org SGkgQ2hyaXN0b3BoLAoKQW0gRG9ubmVyc3RhZywgZGVuIDAxLjA4LjIwMTksIDE2OjAwICswMjAw IHNjaHJpZWIgQ2hyaXN0b3BoIEhlbGx3aWc6Cj4gT24gVGh1LCBBdWcgMDEsIDIwMTkgYXQgMTA6 MzU6MDJBTSArMDIwMCwgTHVjYXMgU3RhY2ggd3JvdGU6Cj4gPiBIaSBDaHJpc3RvcGgsCj4gPiAK PiA+IEFtIERvbm5lcnN0YWcsIGRlbiAwMS4wOC4yMDE5LCAwOToyOSArMDIwMCBzY2hyaWViIENo cmlzdG9waCBIZWxsd2lnOgo+ID4gPiBIaSBMdWthcywKPiA+ID4gCj4gPiA+IGhhdmUgeW91IHRy aWVkIHRoZSBsYXRlc3QgNS4zLXJjIGtlcm5lbCwgd2hlcmUgd2UgbGltaXRlZCB0aGUgTlZNZQo+ ID4gPiBJL08gc2l6ZSBiYXNlZCBvbiB0aGUgc3dpb3RsYiBidWZmZXIgc2l6ZT8KPiA+IAo+ID4g WWVzLCB0aGUgaXNzdWUgd2FzIHJlcHJvZHVjZWQgb24gNS4zLXJjMi4gSSBub3cgc2VlIHlvdXIg Y29tbWl0Cj4gPiBsaW1pdGluZyB0aGUgcmVxdWVzdCBzaXplLCBzbyBJIGd1ZXNzIEkgbmVlZCB0 byBkaWcgaW4gdG8gc2VlIHdoeSBJJ20KPiA+IHN0aWxsIGdldHRpbmcgcmVxdWVzdHMgbGFyZ2Vy IHRoYW4gdGhlIFNXSU9UTEIgbWF4IHNlZ21lbnQgc2l6ZS4gVGhhbmtzCj4gPiBmb3IgdGhlIHBv aW50ZXIhCj4gCj4gYSBzaW1pbGFyIHNldHVwIHRvIHlvdXJzIHRoZQo+IGRtYV9hZGRyZXNzaW5n X2xpbWl0ZWQgZG9lc24ndCB3b3JrLCBidXQgaWYgd2UgY2hhbmdlZCBpdCB0byBhIDw9Cj4gaXQg ZG9lcy7CoMKgVGhlIHJlc3VsdCBpcyBjb3VudGVyIHRvIHdoYXQgSSdkIGV4cGVjdCwgYnV0IGJl Y2F1c2UgSSdtIG9uCj4gdmFjYXRpb24gSSBkaWRuJ3QgaGF2ZSB0aW1lIHRvIGxvb2sgaW50byB3 aHkgaXQgd29ya3MuwqDCoFRoaXMgaXMgaGlzCj4gcGF0Y2gsIGxldCBtZSBrbm93IGlmIHRoaXMg d29ya3MgZm9yIHlvdToKPiAKPiAKPiBkaWZmIC0tZ2l0IGEvaW5jbHVkZS9saW51eC9kbWEtbWFw cGluZy5oIGIvaW5jbHVkZS9saW51eC9kbWEtbWFwcGluZy5oCj4gaW5kZXggZjdkMWVlYTMyYzc4 Li44OWFjMWNmNzU0Y2MgMTAwNjQ0Cj4gLS0tIGEvaW5jbHVkZS9saW51eC9kbWEtbWFwcGluZy5o Cj4gKysrIGIvaW5jbHVkZS9saW51eC9kbWEtbWFwcGluZy5oCj4gQEAgLTY4OSw3ICs2ODksNyBA QCBzdGF0aWMgaW5saW5lIGludCBkbWFfY29lcmNlX21hc2tfYW5kX2NvaGVyZW50KHN0cnVjdCBk ZXZpY2UgKmRldiwgdTY0IG1hc2spCj4gwqAgKi8KPiDCoHN0YXRpYyBpbmxpbmUgYm9vbCBkbWFf YWRkcmVzc2luZ19saW1pdGVkKHN0cnVjdCBkZXZpY2UgKmRldikKPiDCoHsKPiA+IC0JcmV0dXJu IG1pbl9ub3RfemVybyhkbWFfZ2V0X21hc2soZGV2KSwgZGV2LT5idXNfZG1hX21hc2spIDwKPiA+ ICsJcmV0dXJuIG1pbl9ub3RfemVybyhkbWFfZ2V0X21hc2soZGV2KSwgZGV2LT5idXNfZG1hX21h c2spIDw9Cj4gPiDCoAkJCcKgwqDCoMKgZG1hX2dldF9yZXF1aXJlZF9tYXNrKGRldik7Cj4gwqB9 CgpGcm9tIHRoZSBwYXRjaCBJIGp1c3Qgc2VudCBpdCBzaG91bGQgYmUgY2xlYXIgd2h5IHRoZSBh Ym92ZSB3b3Jrcy4gV2l0aApteSBwYXRjaCBhcHBsaWVkIEkgY2FuJ3QgcmVwcm9kdWNlIGFueSBp c3N1ZXMgd2l0aCB0aGlzIE5WTWUgZGV2aWNlCmFueW1vcmUuCgpUaGFua3MgZm9yIHBvaW50aW5n IG1lIGludG8gdGhlIHJpZ2h0IGRpcmVjdGlvbiEKClJlZ2FyZHMsCkx1Y2FzCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmlvbW11IG1haWxpbmcgbGlzdApp b21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4Zm91bmRh dGlvbi5vcmcvbWFpbG1hbi9saXN0aW5mby9pb21tdQ==