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Fri, 12 Mar 2021 09:24:54 -0700 To: Robin Murphy , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Minturn Dave B , John Hubbard , Dave Hansen , Ira Weiny , Matthew Wilcox , =?UTF-8?Q?Christian_K=c3=b6nig?= , Jason Gunthorpe , Jason Ekstrand , Daniel Vetter , Dan Williams , Stephen Bates , Jakowski Andrzej , Christoph Hellwig , Xiong Jianxin References: <20210311233142.7900-1-logang@deltatee.com> <20210311233142.7900-7-logang@deltatee.com> <215e1472-5294-d20a-a43a-ff6dfe8cd66e@arm.com> From: Logan Gunthorpe Message-ID: Date: Fri, 12 Mar 2021 09:24:51 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <215e1472-5294-d20a-a43a-ff6dfe8cd66e@arm.com> Content-Language: en-CA X-SA-Exim-Connect-IP: 24.64.145.4 X-SA-Exim-Rcpt-To: jianxin.xiong@intel.com, hch@lst.de, andrzej.jakowski@intel.com, sbates@raithlin.com, dan.j.williams@intel.com, daniel.vetter@ffwll.ch, jason@jlekstrand.net, jgg@ziepe.ca, christian.koenig@amd.com, willy@infradead.org, iweiny@intel.com, dave.hansen@linux.intel.com, jhubbard@nvidia.com, dave.b.minturn@intel.com, iommu@lists.linux-foundation.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, robin.murphy@arm.com X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [RFC PATCH v2 06/11] dma-direct: Support PCI P2PDMA pages in dma-direct map_sg X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210312_162505_358752_D23EA3C3 X-CRM114-Status: GOOD ( 23.18 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org CgpPbiAyMDIxLTAzLTEyIDg6NTIgYS5tLiwgUm9iaW4gTXVycGh5IHdyb3RlOgo+PiArCj4+IMKg wqDCoMKgwqDCoMKgwqDCoCBzZy0+ZG1hX2FkZHJlc3MgPSBkbWFfZGlyZWN0X21hcF9wYWdlKGRl diwgc2dfcGFnZShzZyksCj4+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgc2ct Pm9mZnNldCwgc2ctPmxlbmd0aCwgZGlyLCBhdHRycyk7Cj4+IMKgwqDCoMKgwqDCoMKgwqDCoCBp ZiAoc2ctPmRtYV9hZGRyZXNzID09IERNQV9NQVBQSU5HX0VSUk9SKQo+PiBAQCAtNDExLDcgKzQ0 MCw3IEBAIGludCBkbWFfZGlyZWN0X21hcF9zZyhzdHJ1Y3QgZGV2aWNlICpkZXYsIHN0cnVjdAo+ PiBzY2F0dGVybGlzdCAqc2dsLCBpbnQgbmVudHMsCj4+IMKgIMKgIG91dF91bm1hcDoKPj4gwqDC oMKgwqDCoCBkbWFfZGlyZWN0X3VubWFwX3NnKGRldiwgc2dsLCBpLCBkaXIsIGF0dHJzIHwKPj4g RE1BX0FUVFJfU0tJUF9DUFVfU1lOQyk7Cj4+IC3CoMKgwqAgcmV0dXJuIDA7Cj4+ICvCoMKgwqAg cmV0dXJuIHJldDsKPj4gwqAgfQo+PiDCoCDCoCBkbWFfYWRkcl90IGRtYV9kaXJlY3RfbWFwX3Jl c291cmNlKHN0cnVjdCBkZXZpY2UgKmRldiwgcGh5c19hZGRyX3QKPj4gcGFkZHIsCj4+IGRpZmYg LS1naXQgYS9rZXJuZWwvZG1hL21hcHBpbmcuYyBiL2tlcm5lbC9kbWEvbWFwcGluZy5jCj4+IGlu ZGV4IGI2YTYzMzY3OTkzMy4uYWRjMWE4Mzk1MGJlIDEwMDY0NAo+PiAtLS0gYS9rZXJuZWwvZG1h L21hcHBpbmcuYwo+PiArKysgYi9rZXJuZWwvZG1hL21hcHBpbmcuYwo+PiBAQCAtMTc4LDggKzE3 OCwxNSBAQCB2b2lkIGRtYV91bm1hcF9wYWdlX2F0dHJzKHN0cnVjdCBkZXZpY2UgKmRldiwKPj4g ZG1hX2FkZHJfdCBhZGRyLCBzaXplX3Qgc2l6ZSwKPj4gwqAgRVhQT1JUX1NZTUJPTChkbWFfdW5t YXBfcGFnZV9hdHRycyk7Cj4+IMKgIMKgIC8qCj4+IC0gKiBkbWFfbWFwc19zZ19hdHRycyByZXR1 cm5zIDAgb24gZXJyb3IgYW5kID4gMCBvbiBzdWNjZXNzLgo+PiAtICogSXQgc2hvdWxkIG5ldmVy IHJldHVybiBhIHZhbHVlIDwgMC4KPj4gKyAqIGRtYV9tYXBzX3NnX2F0dHJzIHJldHVybnMgMCBv biBhbnkgcmVzb3VyY2UgZXJyb3IgYW5kID4gMCBvbiBzdWNjZXNzLgo+PiArICoKPj4gKyAqIElm IDAgaXMgcmV0dXJuZWQsIHRoZSBtYXBwaW5nIGNhbiBiZSByZXRyaWVkIGFuZCB3aWxsIHN1Y2Nl ZWQgb25jZQo+PiArICogc3VmZmljaWVudCByZXNvdXJjZXMgYXJlIGF2YWlsYWJsZS4KPiAKPiBU aGF0J3Mgbm90IGEgZ3VhcmFudGVlIHdlIGNhbiB1cGhvbGQuIFJldHJ5aW5nIGZvcmV2ZXIgaW4g dGhlIHZhaW4gaG9wZQo+IHRoYXQgYSBkZXZpY2UgbWlnaHQgZXZvbHZlIHNvbWUgZXh0cmEgYWRk cmVzcyBiaXRzLCBvciBhIGJvdW5jZSBidWZmZXIKPiBtaWdodCBtYWdpY2FsbHkgZ3JvdyBiaWcg ZW5vdWdoIGZvciBhIGdpZ2FudGljIG1hcHBpbmcsIGlzbid0Cj4gbmVjZXNzYXJpbHkgdGhlIGJl c3QgaWRlYS4KClBlcmhhcHMgdGhpcyBpcyBqdXN0IHBvb3JseSB3b3JkZWQuIFJldHVybmluZyAw IGlzIHRoZSBub3JtYWwgY2FzZSBhbmQKbm90aGluZyBoYXMgY2hhbmdlZCB0aGVyZS4gVGhlIGJs b2NrIGxheWVyLCBmb3IgZXhhbXBsZSwgd2lsbCByZXRyeSBpZgp6ZXJvIGlzIHJldHVybmVkIGFz IHRoaXMgb25seSBoYXBwZW5zIGlmIGl0IGZhaWxlZCB0byBhbGxvY2F0ZSByZXNvdXJjZXMKZm9y IHRoZSBtYXBwaW5nLiBUaGUgcmVhc29uIHdlIGhhdmUgdG8gcmV0dXJuIC0xIGlzIHRvIHRlbGwg dGhlIGJsb2NrCmxheWVyIG5vdCB0byByZXRyeSB0aGVzZSByZXF1ZXN0cyBhcyB0aGV5IHdpbGwg bmV2ZXIgc3VjY2VlZCBpbiB0aGUgZnV0dXJlLgoKPj4gKyAqCj4+ICsgKiBJZiB0aGVyZSBhcmUg UDJQRE1BIHBhZ2VzIGluIHRoZSBzY2F0dGVybGlzdCB0aGVuIHRoaXMgZnVuY3Rpb24gbWF5Cj4+ ICsgKiByZXR1cm4gLUVSRU1PVEVJTyB0byBpbmRpY2F0ZSB0aGF0IHRoZSBwYWdlcyBhcmUgbm90 IG1hcHBhYmxlIGJ5IHRoZQo+PiArICogZGV2aWNlLiBJbiB0aGlzIGNhc2UsIGFuIGVycm9yIHNo b3VsZCBiZSByZXR1cm5lZCBmb3IgdGhlIElPIGFzIGl0Cj4+ICsgKiB3aWxsIG5ldmVyIGJlIHN1 Y2Nlc3NmdWxseSByZXRyaWVkLgo+PiDCoMKgICovCj4+IMKgIGludCBkbWFfbWFwX3NnX2F0dHJz KHN0cnVjdCBkZXZpY2UgKmRldiwgc3RydWN0IHNjYXR0ZXJsaXN0ICpzZywgaW50Cj4+IG5lbnRz LAo+PiDCoMKgwqDCoMKgwqDCoMKgwqAgZW51bSBkbWFfZGF0YV9kaXJlY3Rpb24gZGlyLCB1bnNp Z25lZCBsb25nIGF0dHJzKQo+PiBAQCAtMTk3LDcgKzIwNCw3IEBAIGludCBkbWFfbWFwX3NnX2F0 dHJzKHN0cnVjdCBkZXZpY2UgKmRldiwgc3RydWN0Cj4+IHNjYXR0ZXJsaXN0ICpzZywgaW50IG5l bnRzLAo+PiDCoMKgwqDCoMKgwqDCoMKgwqAgZW50cyA9IGRtYV9kaXJlY3RfbWFwX3NnKGRldiwg c2csIG5lbnRzLCBkaXIsIGF0dHJzKTsKPj4gwqDCoMKgwqDCoCBlbHNlCj4+IMKgwqDCoMKgwqDC oMKgwqDCoCBlbnRzID0gb3BzLT5tYXBfc2coZGV2LCBzZywgbmVudHMsIGRpciwgYXR0cnMpOwo+ PiAtwqDCoMKgIEJVR19PTihlbnRzIDwgMCk7Cj4+ICsKPiAKPiBUaGlzIHNjYXJlcyBtZSAtIEkg aGVzaXRhdGUgdG8gaW1hZ2luZSB0aGUgYW1vdW50IG9mIGRyaXZlci9zdWJzeXN0ZW0KPiBjb2Rl IG91dCB0aGVyZSB0aGF0IHdpbGwgc2VlIG5vbnplcm8gYW5kIG1lcnJpbHkgc2V0IG9mZiBpdGVy YXRpbmcgYQo+IG5lZ2F0aXZlIG51bWJlciBvZiBzZWdtZW50cywgaWYgd2Ugb3BlbiB0aGUgZmxv b2RnYXRlcyBvZiBhbGxvd2luZwo+IGltcGxlbWVudGF0aW9ucyB0byByZXR1cm4gZXJyb3IgY29k ZXMgaGVyZS4KClllcywgYnV0IGl0IHdpbGwgbmV2ZXIgaGFwcGVuIG9uIGV4aXN0aW5nIGRyaXZl cnMvc3Vic3lzdGVtcy4gVGhlIG9ubHkKd2F5IGl0IGNhbiByZXR1cm4gYSBuZWdhdGl2ZSBudW1i ZXIgaXMgaWYgdGhlIGRyaXZlciBwYXNzZXMgaW4gUDJQRE1BCnBhZ2VzIHdoaWNoIGNhbid0IGhh cHBlbiB3aXRob3V0IGNoYW5nZXMgaW4gdGhlIGRyaXZlci4gV2UgYXJlIGNhcmVmdWwKYWJvdXQg d2hlcmUgUDJQRE1BIHBhZ2VzIGNhbiBnZXQgaW50byBzbyB3ZSBkb24ndCBoYXZlIHRvIHdvcnJ5 IGFib3V0CmFsbCB0aGUgZXhpc3RpbmcgZHJpdmVyIGNvZGUgb3V0IHRoZXJlLgoKTG9nYW4KCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkxpbnV4LW52bWUg bWFpbGluZyBsaXN0CkxpbnV4LW52bWVAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMu aW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LW52bWUK