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charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" T24gVGh1LCBNYXIgMjUsIDIwMjEgYXQgMDI6MDU6MTRQTSArMDEwMCwgQ2hyaXN0aWFuIEvDtm5p ZyB3cm90ZToKPiAKPiAKPiBBbSAyNS4wMy4yMSB1bSAxMzo0MiBzY2hyaWViIEphc29uIEd1bnRo b3JwZToKPiA+IE9uIFRodSwgTWFyIDI1LCAyMDIxIGF0IDAxOjA5OjE0UE0gKzAxMDAsIENocmlz dGlhbiBLw7ZuaWcgd3JvdGU6Cj4gPiA+IEFtIDI1LjAzLjIxIHVtIDEzOjAxIHNjaHJpZWIgSmFz b24gR3VudGhvcnBlOgo+ID4gPiA+IE9uIFRodSwgTWFyIDI1LCAyMDIxIGF0IDEyOjUzOjE1UE0g KzAxMDAsIFRob21hcyBIZWxsc3Ryw7ZtIChJbnRlbCkgd3JvdGU6Cj4gPiA+ID4gCj4gPiA+ID4g PiBOb3BlLiBUaGUgcG9pbnQgaGVyZSB3YXMgdGhhdCBpbiB0aGlzIGNhc2UsIHRvIG1ha2Ugc3Vy ZSBtbWFwIHVzZXMgdGhlCj4gPiA+ID4gPiBjb3JyZWN0IFZBIHRvIGdpdmUgdXMgYSByZWFzb25h YmxlIGNoYW5jZSBvZiBhbGlnbmVtZW50LCB0aGUgZHJpdmVyIG1pZ2h0Cj4gPiA+ID4gPiBuZWVk IHRvIGJlIGF3YXJlIG9mIGFuZCBkbyB0cmlja2VyeSB3aXRoIHRoZSBodWdlIHBhZ2UtdGFibGUt ZW50cnkgc2l6ZXMKPiA+ID4gPiA+IGFueXdheSwgYWx0aG91Z2ggSSB0aGluayBpbiBtb3N0IGNh c2VzIGEgc3RhbmRhcmQgaGVscGVyIGZvciB0aGlzIGNhbiBiZQo+ID4gPiA+ID4gc3VwcGxpZWQu Cj4gPiA+ID4gT2YgY291cnNlIHRoZSBkcml2ZXIgbmVlZHMgc29tZSB3YXkgdG8gaW5mbHVlbmNl IHRoZSBWQSBtbWFwIHVzZXMsCj4gPiA+ID4gZ2VybmFsbHkgaXQgc2hvdWxkIGFsaWduIHRvIHRo ZSBuYXR1cmFsIHBhZ2Ugc2l6ZSBvZiB0aGUgZGV2aWNlCj4gPiA+IFdlbGwgYSBtbWFwKCkgbmVl ZHMgdG8gYmUgYWxpZ25lZCB0byB0aGUgcGFnZSBzaXplIG9mIHRoZSBDUFUsIGJ1dCBub3QKPiA+ ID4gbmVjZXNzYXJpbHkgdG8gdGhlIG9uZSBvZiB0aGUgZGV2aWNlLgo+ID4gPiAKPiA+ID4gU28g SSdtIHByZXR0eSBzdXJlIHRoZSBkZXZpY2UgZHJpdmVyIHNob3VsZCBub3QgYmUgaW52b2x2ZWQg aW4gYW55IHdheSB0aGUKPiA+ID4gY2hvb3Npbmcgb2YgdGhlIFZBIGZvciB0aGUgQ1BVIG1hcHBp bmcuCj4gPiBObywgaWYgdGhlIGRldmljZSB3YW50cyB0byB1c2UgaHVnZSBwYWdlcyBpdCBtdXN0 IGluZmx1ZW5jZSB0aGUgbW1hcAo+ID4gVkEgb3IgaXQgY2FuJ3QgZm9ybSBodWdlIHBnYWVzLgo+ IAo+IE5vLCB0aGF0J3MgdGhlIGpvYiBvZiB0aGUgY29yZSBNTSBhbmQgbm90IG9mIHRoZSBpbmRp dmlkdWFsIGRyaXZlci4KClRoZSBjb3JlIG1tIGRvZXNuJ3Qga25vdyB0aGUgcGFnZSBzaXplIG9m IHRoZSBkZXZpY2UsIG9ubHkgd2hpY2ggb2YKc2V2ZXJhbCBwYWdlIGxldmVscyB0aGUgYXJjaCBz dXBwb3J0cy4gVGhlIGRldmljZSBtdXN0IGJlIGludm9sZXZkCmhlcmUuCgpKYXNvbgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpkcmktZGV2ZWwgbWFpbGlu ZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVl ZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK 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, MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS 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 03F5CC433DB for ; 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identity=mailfrom; envelope-from=""; helo=NAM04-BN3-obe.outbound.protection.outlook.com; client-ip=40.107.68.86 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616678279-194816 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 25, 2021 at 02:05:14PM +0100, Christian K=C3=B6nig wrote: >=20 >=20 > Am 25.03.21 um 13:42 schrieb Jason Gunthorpe: > > On Thu, Mar 25, 2021 at 01:09:14PM +0100, Christian K=C3=B6nig wrote: > > > Am 25.03.21 um 13:01 schrieb Jason Gunthorpe: > > > > On Thu, Mar 25, 2021 at 12:53:15PM +0100, Thomas Hellstr=C3=B6m (= Intel) wrote: > > > >=20 > > > > > Nope. The point here was that in this case, to make sure mmap u= ses the > > > > > correct VA to give us a reasonable chance of alignement, the dr= iver might > > > > > need to be aware of and do trickery with the huge page-table-en= try sizes > > > > > anyway, although I think in most cases a standard helper for th= is can be > > > > > supplied. > > > > Of course the driver needs some way to influence the VA mmap uses= , > > > > gernally it should align to the natural page size of the device > > > Well a mmap() needs to be aligned to the page size of the CPU, but = not > > > necessarily to the one of the device. > > >=20 > > > So I'm pretty sure the device driver should not be involved in any = way the > > > choosing of the VA for the CPU mapping. > > No, if the device wants to use huge pages it must influence the mmap > > VA or it can't form huge pgaes. >=20 > No, that's the job of the core MM and not of the individual driver. The core mm doesn't know the page size of the device, only which of several page levels the arch supports. The device must be involevd here. Jason