From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jordan Crouse Subject: [VERY RFC 0/2] iommu: optionally skip attaching to a DMA domain Date: Wed, 11 Apr 2018 12:55:08 -0600 Message-ID: <20180411185510.11594-1-jcrouse@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: freedreno-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Freedreno" To: will.deacon-5wv7dgnIgG8@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org Cc: linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: iommu@lists.linux-foundation.org SSd2ZSBiZWVuIHN0cnVnZ2xpbmcgd2l0aCBhIHByb2JsZW0gZm9yIGEgd2hpbGUgYW5kIEkgaGF2 ZW4ndCBiZWVuIGFibGUgdG8gY29tZQp1cCB3aXRoIGEgY2xlYW4gc29sdXRpb24uIFJvYiBjb252 aW5jZWQgbWUgdG8gc3RvcCBjb21wbGFpbmluZyBhbmQgZG8KX3NvbWV0aGluZ18gYW5kIGhvcGVm dWxseSB0aGlzIGNhbiBzcHVyIGEgZ29vZCBkaXNjdXNzaW9uLgoKVGhlIHNjZW5hcmlvIGlzIGJh c2ljYWxseSB0aGlzOiBUaGUgTVNNIEdQVSB3YW50cyB0byBtYW5hZ2UgaXRzIG93biBJT01NVQp2 aXJ0dWFsIGFkZHJlc3Mgc3BhY2UgaW4gbGlldSBvZiB1c2luZyB0aGUgRE1BIEFQSSB0byBkbyBz by4gVGhlIG1vc3QgaW1wb3J0YW50CnJlYXNvbiBpcyB0aGF0IHdoZW4gcGVyLWluc3RhbmNlIHBh Z2V0YWJsZXMgWzFdIGFyZSBlbmFibGVkIGVhY2ggZmlsZSBkZXNjcmlwdG9yCnVzZXMgaXRzIG93 biBwYWdldGFibGUgd2hpY2ggYXJlIGR5bmFtaWNhbGx5IHN3aXRjaGVkIGJldHdlZW4gY29udGV4 dHMuIEluCmNvbmp1bmN0aW9uIHdpdGggdGhpcyB3ZSB1c2UgYSBzcGxpdCBwYWdldGFibGUgc2No ZW1lIHRvIGFsbG93IGdsb2JhbCBidWZmZXJzIApiZSBwZXJzaXN0ZW50bHkgbWFwcGVkIHNvIGV2 ZW4gYSBzaW5nbGUgcGFnZXRhYmxlIGhhcyBtdWx0aXBsZSByYW5nZXMgdGhhdCBuZWVkCnRvIGJl IHV0aWxpemVkIGJhc2VkIG9uIGJ1ZmZlciB0eXBlLgoKT2J2aW91c2x5IHRoZSBETUEgQVBJIGlz bid0IHN1aXRhYmxlIGZvciB0aGlzIGtpbmQgb2Ygc3BlY2lhbGl6ZWQgdXNlLiBXZSB3YW50CnRv IHB1c2ggaXQgb2ZmIHRvIHRoZSBzaWRlLCBhbGxvY2F0ZSBvdXIgb3duIGRvbWFpbiwgYW5kIHVz ZSBpdCBkaXJlY3RseSB3aXRoCnRoZSBJT01NVSBBUElzLiBJbiBhIHBlcmZlY3Qgd29ybGQgd2Ug d291bGQganVzdCBub3QgdXNlIHRoZSBETUEgQVBJIGFuZCBhdHRhY2gKb3VyIG93biBkb21haW4g YW5kIHRoYXQgd291bGQgYmUgdGhlIGVuZCBvZiB0aGUgc3RvcnkuIFVuZm9ydHVuYXRlbHkgdGhp cyBpcyBub3QKYSBwZXJmZWN0IHdvcmxkLgoKSW4gb3JkZXIgdG8gc3dpdGNoIHRoZSBwYWdldGFi bGUgZnJvbSB0aGUgR1BVIHRoZSBTb0MgaGFzIHNvbWUgc3BlY2lhbCB3aXJpbmcgc28KdGhhdCB0 aGUgR1BVIGNhbiByZXByb2dyYW0gdGhlIFRUQlIwIHJlZ2lzdGVyIGluIHRoZSBJT01NVSB0byB0 aGUgYXBwcm9wcmlhdGUKdmFsdWUuIEZvciBhIHZhcmlldHkgb2YgcmVhc29ucyB0aGUgaGFyZHdh cmUgaXMgaGFyZGNvZGVkIHRvIG9ubHkgYmUgYWJsZSB0bwphY2Nlc3MgY29udGV4dCBiYW5rIDAg aW4gdGhlIFNNTVUgZGV2aWNlLiBMb25nIHN0b3J5IHNob3J0OyBpZiB0aGUgRE1BCmRvbWFpbiBp cyBhbGxvY2F0ZWQgZHVyaW5nIGJ1cyBlbnVtZXJhdGlvbiBhbmQgYXR0YWNoZWQgdG8gY29udGV4 dCBiYW5rIDAgdGhlbgpieSB0aGUgdGltZSB3ZSBnZXQgdG8gdGhlIGRyaXZlciBkb21haW4gd2Ug aGF2ZSBsb25nIHNpbmNlIGxvc3Qgb3VyIGNoYW5jZSB0bwpnZXQgdGhlIGNvbnRleHQgYmFuayB3 ZSBuZWVkLgoKQWZ0ZXIgZ29pbmcgYmFjayBhbmQgZm9ydGggYW5kIHRyeWluZyBhIGZldyBwb3Nz aWJsZSBvcHRpb25zIGl0IHNlZW1zIGxpa2UgdGhlCiJlYXNpZXN0IiBzb2x1dGlvbiIgaXMgdG8g c2tpcCBhdHRhY2hpbmcgdGhlIERNQSBkb21haW4gaW4gdGhlIGZpcnN0IHBsYWNlLiBCdXQKd2Ug c3RpbGwgbmVlZCB0byBjcmVhdGUgYSBkZWZhdWx0IGRvbWFpbiBhbmQgc2V0IHVwIHRoZSBJT01N VSBncm91cHMgY29ycmVjdGx5CnNvIHRoYXQgd2hlbiB0aGUgR1BVIGRyaXZlciBjb21lcyBhbG9u ZyBpdCBjYW4gYXR0YWNoIHRoZSBkZXZpY2UgYW5kIGV2ZXJ5dGhpbmcKd2lsbCBKdXN0IFdvcmsg KFRNKS4gUm9iIHN1Z2dlc3RlZCB0aGF0IHdlIHNob3VsZCB1c2UgYSBibGFja2xpc3Qgb2YgZGV2 aWNlcwp0aGF0IGNob29zZSB0byBub3QgcGFydGljaXBhdGUgc28gdGhhdHMgd2hhdCBJJ20gb2Zm ZXJpbmcgYXMgYSBzdGFydGluZyBwb2ludApmb3IgZGlzY3Vzc2lvbi4KClRoZSBmaXJzdCBwYXRj aCBpbiB0aGlzIHNlcmllcyBhbGxvd3MgdGhlIHNwZWNpZmljIElPTU1VIGRyaXZlciB0byBncmFj ZWZ1bGx5CnNraXAgYXR0YWNoaW5nIGEgZGV2aWNlIGJ5IHJldHVybmluZyAtRU5PU1VQUC4gSW4g dGhhdCBjYXNlLCB0aGUgY29yZSB3aWxsCnNraXAgcHJpbnRpbmcgZXJyb3IgbWVzc2FnZXMgYW5k IGl0IHdvbid0IGF0dGFjaCB0aGUgZG9tYWluIHRvIHRoZSBncm91cCBidXQKaXQgc3RpbGwgYWxs b3dzIHRoZSBncm91cCB0byBnZXQgY3JlYXRlZCBzbyB0aGF0IHRoZSBJT01NVSBkZXZpY2UgaXMg cHJvcGVybHkKc2V0IHVwLiBJbiBhcmNoX3NldHVwX2RtYV9vcHMoKSB0aGUgY2FsbCB0byBpb21t dV9nZXRfZG9tYWluX2Zvcl9kZXYoKSB3aWxsCnJldHVybiBOVUxMIGFuZCB0aGUgSU9NTVUgb3Bz IHdvbid0IGJlIHNldCB1cC4KClRoZSBzZWNvbmQgcGF0Y2ggaW1wbGVtZW50cyB0aGUgYmxhY2ts aXN0IGluIGFybS1zbW11LmMgYmFzZWQgb24gdGhlIGNvbXBhdGlibGUKc3RyaW5nIG9mIHRoZSBH UFUgZGV2aWNlIGFuZCByZXR1cm5zIC1FTk9UU1VQUC4KCkkgdGVzdGVkIHRoaXMgd2l0aCBteSBj dXJyZW50IHBlci1pbnN0YW5jZSBwYWdldGFibGUgc3RhY2sgYW5kIGl0IGRvZXMgdGhlIGpvYgpi dXQgSSBhbSB2ZXJ5IG11Y2ggaW4gdGhlIG1hcmtldCBmb3IgYmV0dGVyIGlkZWFzLgoKWzFdIGh0 dHBzOi8vcGF0Y2h3b3JrLmZyZWVkZXNrdG9wLm9yZy9zZXJpZXMvMzg3MjkvCgpKb3JkYW4gQ3Jv dXNlICgyKToKICBpb21tdTogR3JhY2VmdWxseSBhbGxvdyBkcml2ZXJzIHRvIG5vdCBhdHRhY2gg dG8gYSBkZWZhdWx0IGRvbWFpbgogIGlvbW11L2FybS1zbW11OiBBZGQgbGlzdCBvZiBkZXZpY2Vz IHRvIG9wdCBvdXQgb2YgRE1BIGRvbWFpbnMKCiBkcml2ZXJzL2lvbW11L2FybS1zbW11LmMgfCAy MyArKysrKysrKysrKysrKysrKysrKysrKwogZHJpdmVycy9pb21tdS9pb21tdS5jICAgIHwgMTgg KysrKysrKysrKysrKystLS0tCiAyIGZpbGVzIGNoYW5nZWQsIDM3IGluc2VydGlvbnMoKyksIDQg ZGVsZXRpb25zKC0pCgotLSAKMi4xNi4xCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpGcmVlZHJlbm8gbWFpbGluZyBsaXN0CkZyZWVkcmVub0BsaXN0cy5m cmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0 aW5mby9mcmVlZHJlbm8K