From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Date: Sat, 15 Apr 2017 08:07:23 +1000 Message-ID: <1492207643.25766.18.camel@kernel.crashing.org> References: <1490911959-5146-1-git-send-email-logang@deltatee.com> <1491974532.7236.43.camel@kernel.crashing.org> <5ac22496-56ec-025d-f153-140001d2a7f9@deltatee.com> <1492034124.7236.77.camel@kernel.crashing.org> <81888a1e-eb0d-cbbc-dc66-0a09c32e4ea2@deltatee.com> <20170413232631.GB24910@bhelgaas-glaptop.roam.corp.google.com> <20170414041656.GA30694@obsidianresearch.com> <1492169849.25766.3.camel@kernel.crashing.org> <630c1c63-ff17-1116-e069-2b8f93e50fa2@deltatee.com> <20170414190452.GA15679@bhelgaas-glaptop.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20170414190452.GA15679-1RhO1Y9PlrlHTL0Zs8A6p5iNqAH0jzoTYJqu5kTmcBRl57MIdRCFDg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Bjorn Helgaas , Logan Gunthorpe Cc: Jens Axboe , Keith Busch , "James E.J. Bottomley" , "Martin K. Petersen" , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Steve Wise , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Jason Gunthorpe , Jerome Glisse , linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org, Max Gurtovoy , Christoph Hellwig List-Id: linux-rdma@vger.kernel.org T24gRnJpLCAyMDE3LTA0LTE0IGF0IDE0OjA0IC0wNTAwLCBCam9ybiBIZWxnYWFzIHdyb3RlOgo+ IEknbSBhIGxpdHRsZSBoZXNpdGFudCBhYm91dCBleGNsdWRpbmcgb2Zmc2V0IHN1cHBvcnQsIHNv IEknZCBsaWtlIHRvCj4gaGVhciBtb3JlIGFib3V0IHRoaXMuCj4gCj4gSXMgdGhlIGlzc3VlIHJl bGF0ZWQgdG8gUENJIEJBUnMgdGhhdCBhcmUgbm90IGNvbXBsZXRlbHkgYWRkcmVzc2FibGUKPiBi eSB0aGUgQ1BVP8KgIElmIHNvLCB0aGF0IHNvdW5kcyBsaWtlIGEgZmlyc3QtY2xhc3MgaXNzdWUg dGhhdCBzaG91bGQKPiBiZSByZXNvbHZlZCB1cCBmcm9udCBiZWNhdXNlIEkgZG9uJ3QgdGhpbmsg dGhlIFBDSSBjb3JlIGluIGdlbmVyYWwKPiB3b3VsZCBkZWFsIHdlbGwgd2l0aCB0aGF0Lgo+IAo+ IElmIGFsbCB0aGUgUENJIG1lbW9yeSBvZiBpbnRlcmVzdCBpcyBpbiBmYWN0IGFkZHJlc3NhYmxl IGJ5IHRoZSBDUFUsCj4gSSB3b3VsZCB0aGluayBpdCB3b3VsZCBiZSBwcmV0dHkgc3RyYWlnaHRm b3J3YXJkIHRvIHN1cHBvcnQgb2Zmc2V0cwo+IC0tCj4gZXZlcnl3aGVyZSB5b3UgY3VycmVudGx5 IHVzZSBhIFBDSSBidXMgYWRkcmVzcywgeW91IGp1c3QgdXNlIHRoZQo+IGNvcnJlc3BvbmRpbmcg Q1BVIHBoeXNpY2FsIGFkZHJlc3MgaW5zdGVhZC4KCkl0J3Mgbm90ICp0aGF0KiBlYXN5IHNhZGx5 LiBUaGUgcmVhc29uIGlzIHRoYXQgbm9ybWFsIGRtYSBtYXAgQVBJcwphc3N1bWUgdGhlICJ0YXJn ZXQiIG9mIHRoZSBETUFzIGFyZSBzeXN0ZW0gbWVtb3J5LCB0aGVyZSBpcyBubyB3YXkgdG8KcGFz cyBpdCAiYW5vdGhlciBkZXZpY2UiLCBpbiBhIHdheSB0aGF0IGFsbG93cyBpdCB0byB1bmRlcnN0 YW5kIHRoZQpvZmZzZXRzIGlmIG5lZWRlZC4KClRoYXQgc2FpZCwgZG1hX21hcCB3aWxsIGFscmVh ZHkgYmUgcHJvYmxlbWF0aWMgd2hlbiBkb2luZyBwMnAgYmVoaW5kCnRoZSBzYW1lIGJyaWRnZSBk dWUgdG8gdGhlIGZhY3QgdGhhdCB0aGUgaW9tbXUgaXMgbm90IGluIHRoZSB3YXkgc28geW91CmNh bid0IHVzZSB0aGUgYXJjaCBzdGFuZGFyZCBvcHMgdGhlcmUuCgpTbyBJIGFzc3VtZSB0aGUgcDJw IGNvZGUgcHJvdmlkZXMgYSB3YXkgdG8gYWRkcmVzcyB0aGF0IHRvbyB2aWEgc3BlY2lhbApkbWFf b3BzID8gT3Igd3JhcHBlcnMgPwoKQmFzaWNhbGx5IHRoZXJlIGFyZSB0d28gdmVyeSBkaWZmZXJl bnQgd2F5cyB5b3UgY2FuIGRvIHAycCwgZWl0aGVyCmJlaGluZCB0aGUgc2FtZSBob3N0IGJyaWRn ZSBvciBhY2Nyb3NzIHR3byBob3N0IGJyaWRnZXM6CgogLSBCZWhpbmQgdGhlIHNhbWUgaG9zdCBi cmlkZ2UsIHlvdSBkb24ndCBnbyB0aHJvdWdoIHRoZSBpb21tdSwgd2hpY2gKbWVhbnMgdGhhdCBl dmVuIGlmIHlvdXIgdGFyZ2V0IGxvb2tzIGxpa2UgYSBzdHJ1Y3QgcGFnZSwgeW91IGNhbid0IGp1 c3QKdXNlIGRtYV9tYXBfKiBvbiBpdCBiZWNhdXNlIHdoYXQgeW91J2xsIGdldCBiYWNrIGZyb20g dGhhdCBpcyBhbiBpb21tdQp0b2tlbiwgbm90IGEgc2libGluZyBCQVIgb2Zmc2V0LiBBZGRpdGlv bmFsbHksIGlmIHlvdSB1c2UgdGhlIHRhcmdldApzdHJ1Y3QgcmVzb3VyY2UgYWRkcmVzcywgeW91 IHdpbGwgbmVlZCB0byBvZmZzZXQgaXQgdG8gZ2V0IGJhY2sgdG8gdGhlCmFjdHVhbCBCQVIgdmFs dWUgb24gdGhlIFBDSWUgYnVzLgoKIC0gQmVoaW5kIGRpZmZlcmVudCBob3N0IGJyaWRnZXMsIHRo ZW4geW91IGdvIHRocm91Z2ggdGhlIGlvbW11IGFuZCB0aGUKaG9zdCByZW1hcHBpbmcuIElFLiB0 aGF0J3MgYWN0dWFsbHkgdGhlIGVhc3kgY2FzZS4gWW91IGNhbiBwcm9iYWJseQpqdXN0IHVzZSB0 aGUgbm9ybWFsIGlvbW11IHBhdGggYW5kIG5vcm1hbCBkbWEgbWFwcGluZyBvcHMsIHlvdSBqdXN0 Cm5lZWQgdG8gaGF2ZSB5b3VyIHN0cnVjdCBwYWdlIHJlcHJlc2VudGluZyB0aGUgdGFyZ2V0IGRl dmljZSBCQVIgKmluCkNQVSBzcGFjZSogdGhpcyB0aW1lLiBTbyBubyBvZmZzZXR0aW5nIHJlcXVp cmVkIGVpdGhlci4KClRoZSBwcm9ibGVtIGlzIHRoYXQgdGhlIGxhdHRlciB3aGlsZSBzZWVtaW5n bHkgZWFzaWVyLCBpcyBhbHNvIHNsb3dlcgphbmQgbm90IHN1cHBvcnRlZCBieSBhbGwgcGxhdGZv cm1zIGFuZCBhcmNoaXRlY3R1cmVzIChmb3IgZXhhbXBsZSwKUE9XRVIgY3VycmVudGx5IHdvbid0 IGFsbG93IGl0LCBvciByYXRoZXIgb25seSBhbGxvd3MgYSBzdG9yZS1vbmx5CnN1YnNldCBvZiBp dCB1bmRlciBzcGVjaWFsIGNpcmN1bXN0YW5jZXMpLgoKU28gd2hhdCBwZW9wbGUgcHJhY3RpY2Fs bHkgd2FudCB0byBkbyBpcyB0byBoYXZlIDIgZGV2aWNlcyBiZWhpbmQgYQpzd2l0Y2ggRE1BJ2lu ZyB0by9mcm9tIGVhY2ggb3RoZXIuCgpCdXQgdGhhdCBicmluZ3MgdGhlIDIgcHJvYmxlbXMgYWJv dmUuCgpJIGRvbid0IGZ1bGx5IHVuZGVyc3RhbmQgaG93IHAycG1lbSAic29sdmVzIiB0aGF0IGJ5 IGNyZWF0aW5nIHN0cnVjdApwYWdlcy4gVGhlIG9mZnNldCBwcm9ibGVtIGlzIG9uZSBpc3N1ZS4g QnV0IHRoZXJlJ3MgdGhlIGlvbW11IGlzc3VlIGFzCndlbGwsIHRoZSBkcml2ZXIgY2Fubm90IGp1 c3QgdXNlIHRoZSBub3JtYWwgZG1hX21hcCBvcHMuCgpJIGhhdmVuJ3QgaGFkIGEgY2hhbmNlIHRv IGxvb2sgYXQgdGhlIGRldGFpbHMgb2YgdGhlIHBhdGNoZXMgYnV0IGl0J3MKbm90IGNsZWFyIGZy b20gdGhlIGRlc2NyaXB0aW9uIGluIHBhdGNoIDAgaG93IHRoYXQgaXMgc29sdmVkLgoKQ2hlZXJz LApCZW4uCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpM aW51eC1udmRpbW0gbWFpbGluZyBsaXN0CkxpbnV4LW52ZGltbUBsaXN0cy4wMS5vcmcKaHR0cHM6 Ly9saXN0cy4wMS5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1udmRpbW0K