From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756773Ab1KLBUx (ORCPT ); Fri, 11 Nov 2011 20:20:53 -0500 Received: from casper.infradead.org ([85.118.1.10]:42751 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753037Ab1KLBUw (ORCPT ); Fri, 11 Nov 2011 20:20:52 -0500 Message-ID: <1321060841.2006.35.camel@shinybook.infradead.org> Subject: Re: [PATCH] intel-iommu: Default to non-coherent for domains unattached to iommus From: David Woodhouse To: Chris Wright Cc: Roland Dreier , Alex Williamson , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ddutile@redhat.com Date: Sat, 12 Nov 2011 01:20:41 +0000 In-Reply-To: <20111112010850.GT14486@sequoia.sous-sol.org> References: <20111111224849.9756.13368.stgit@bling.home> <1321058267.2006.21.camel@shinybook.infradead.org> <20111112005100.GR14486@sequoia.sous-sol.org> <1321059340.2006.27.camel@shinybook.infradead.org> <20111112010850.GT14486@sequoia.sous-sol.org> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-s6s7aD8oiSJsRQJuDIHQ" X-Mailer: Evolution 3.2.1 (3.2.1-2.fc16) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-s6s7aD8oiSJsRQJuDIHQ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2011-11-11 at 17:08 -0800, Chris Wright wrote: > All the stale PTE issues I've encountered in the past have turned into > fixed sw bugs (perhaps it's since been fixed?). Also, I thought with > Coherency On/Off it's only effecting the use of clflush, not IOTLB or > Context Entry cache flushing (invalidations). Yeah, it's supposed to be *just* clflush. Nevertheless, I can imagine it being screwed up and there actually being a buffer in the chipset too. We certainly made that mistake with the graphics engine in some cases... > On a slightly separate, but performance related note...have you ever > tried using the hw queue? Currently we only have a sw queue, but the > submission path for invalidations doesn't really queue (unless I missed > it). It seems to pull from the software queue and submit/wait, > submit/wait...Seems simple enough to submit the whole queue and then > issue the wait. I have a feeling we trigger errata if we do that =E2=80=94 although if we'r= e only doing it for an emulated IOMMU that shouldn't be an issue. --=20 dwmw2 --=-s6s7aD8oiSJsRQJuDIHQ Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIITvzCCBi0w ggQVoAMCAQICAwCtOTANBgkqhkiG9w0BAQUFADBUMRQwEgYDVQQKEwtDQWNlcnQgSW5jLjEeMBwG A1UECxMVaHR0cDovL3d3dy5DQWNlcnQub3JnMRwwGgYDVQQDExNDQWNlcnQgQ2xhc3MgMyBSb290 MB4XDTEwMDYxMjEwMDMwMFoXDTEyMDYxMTEwMDMwMFowgegxGDAWBgNVBAMTD0RhdmlkIFdvb2Ro b3VzZTEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzEfMB0GCSqGSIb3DQEJARYQ ZGF2aWRAd29vZGhvdS5zZTEoMCYGCSqGSIb3DQEJARYZZGF2aWQud29vZGhvdXNlQGludGVsLmNv bTEkMCIGCSqGSIb3DQEJARYVZHdtdzJAbGludXguaW50ZWwuY29tMTcwNQYJKoZIhvcNAQkBFigx MDg3MmEwN2Y2ZDdlMWUwN2Y1NWZmMTcyYTAzYjMwMGVlYWFkMjAzMIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEA29OPhNvMxBMW83psWdVhZDtmJvgN+tBEp1r6MZamONsR0k81a6fDFwJz M0fEzEbV/bDG102QyX/xXC/0IpKV4acnqESC+sTHUmRwxfRKGNmR6t2iwEs2Y5kQDF31JxbCt49w AlhLMAa+e1MBZ7vO0uDmRuJpS7+ZdHboq7cdk6dyoeumGv5sl6U/SPK9rL4KzULtqQaw6Wucd6MJ irIggEHfCNqeT5a+TyuH4zKCwv9nblIGXq9wt+yqu5t/RicGaKPnXSqo/WpJAGggaO8g92mnYlVl Wu/b9bYVISwQ8LI0sEtjN1WnP5AQO2f59bdPAVk4Rn25HceOO4NvlG47LwIDAQABo4IBcTCCAW0w DAYDVR0TAQH/BAIwADBWBglghkgBhvhCAQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRl IGZvciBGUkVFIGhlYWQgb3ZlciB0byBodHRwOi8vd3d3LkNBY2VydC5vcmcwQAYDVR0lBDkwNwYI KwYBBQUHAwQGCCsGAQUFBwMCBgorBgEEAYI3CgMEBgorBgEEAYI3CgMDBglghkgBhvhCBAEwMgYI KwYBBQUHAQEEJjAkMCIGCCsGAQUFBzABhhZodHRwOi8vb2NzcC5jYWNlcnQub3JnMIGOBgNVHREE gYYwgYOBE2R3bXcyQGluZnJhZGVhZC5vcmeBEGRhdmlkQHdvb2Rob3Uuc2WBGWRhdmlkLndvb2Ro b3VzZUBpbnRlbC5jb22BFWR3bXcyQGxpbnV4LmludGVsLmNvbYEoMTA4NzJhMDdmNmQ3ZTFlMDdm NTVmZjE3MmEwM2IzMDBlZWFhZDIwMzANBgkqhkiG9w0BAQUFAAOCAgEAXm+SUO1/TSeGJK0D9pAm E9LTFkdlgbaD6HXGbS0TNUDyfLFkacc2F1JLoWcoFwcL6Rup5o/Rt4QYDBPWgF9EXFvqsc9SLrSe X6VwRj7vI40x19ThE2A1Y8DzBJ9+2MzIR6hd5n9axATCOIRhmZVjX1cRkwshEGvAn8mTYGhWttkx WhBcaAuCd9OOQqUwfxTUXiSfVumPUNrrbuvaH6MjrNjDrXdvicL26Y+AzFSJn3o8DShjjMhkUx9l qV46BpjSGIuvkHhcLkGJ3Y1YmtOX1hwT+Z+d/10WJh8ZG2FqIlJtPtqvHK5ol/KvdzMwmMBd4qFj YAO32vf7zde+jdTHNp2Mb15bJHhNdGOsZicpGue42fg3deZQFe1E2KBl9VO09fjncjt9YdhCUtxO buDnoOixY6YSJgSmGJB2Xs+TE5gps4UiiOYen+NeJkuwg5x9vmyraU061Uc0csfc/E5IoxhTX/Pc H+zXiER8aSjA/9MXQfrJM2xkY6UNKlDbCYSLKnH/O02eu7Hma6lB4wtcY8ECu7LJuFY2448Quolv SQfQLRvKauGFGUAhbPClOxObuv/fNzA+lfg8DX2y5jXDutnpvBGgsplKxoah01SZfR9zNqxodPx2 srKhujBNB+WiAZntMf0xp4e0JPMlTFxm3tbY9wuBSyTJyueO9hUkbN4wggYtMIIEFaADAgECAgMA rTkwDQYJKoZIhvcNAQEFBQAwVDEUMBIGA1UEChMLQ0FjZXJ0IEluYy4xHjAcBgNVBAsTFWh0dHA6 Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMTQ0FjZXJ0IENsYXNzIDMgUm9vdDAeFw0xMDA2MTIx MDAzMDBaFw0xMjA2MTExMDAzMDBaMIHoMRgwFgYDVQQDEw9EYXZpZCBXb29kaG91c2UxIjAgBgkq hkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcxHzAdBgkqhkiG9w0BCQEWEGRhdmlkQHdvb2Ro b3Uuc2UxKDAmBgkqhkiG9w0BCQEWGWRhdmlkLndvb2Rob3VzZUBpbnRlbC5jb20xJDAiBgkqhkiG 9w0BCQEWFWR3bXcyQGxpbnV4LmludGVsLmNvbTE3MDUGCSqGSIb3DQEJARYoMTA4NzJhMDdmNmQ3 ZTFlMDdmNTVmZjE3MmEwM2IzMDBlZWFhZDIwMzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC ggEBANvTj4TbzMQTFvN6bFnVYWQ7Zib4DfrQRKda+jGWpjjbEdJPNWunwxcCczNHxMxG1f2wxtdN kMl/8Vwv9CKSleGnJ6hEgvrEx1JkcMX0ShjZkerdosBLNmOZEAxd9ScWwrePcAJYSzAGvntTAWe7 ztLg5kbiaUu/mXR26Ku3HZOncqHrphr+bJelP0jyvay+Cs1C7akGsOlrnHejCYqyIIBB3wjank+W vk8rh+MygsL/Z25SBl6vcLfsqrubf0YnBmij510qqP1qSQBoIGjvIPdpp2JVZVrv2/W2FSEsEPCy NLBLYzdVpz+QEDtn+fW3TwFZOEZ9uR3HjjuDb5RuOy8CAwEAAaOCAXEwggFtMAwGA1UdEwEB/wQC MAAwVgYJYIZIAYb4QgENBEkWR1RvIGdldCB5b3VyIG93biBjZXJ0aWZpY2F0ZSBmb3IgRlJFRSBo ZWFkIG92ZXIgdG8gaHR0cDovL3d3dy5DQWNlcnQub3JnMEAGA1UdJQQ5MDcGCCsGAQUFBwMEBggr BgEFBQcDAgYKKwYBBAGCNwoDBAYKKwYBBAGCNwoDAwYJYIZIAYb4QgQBMDIGCCsGAQUFBwEBBCYw JDAiBggrBgEFBQcwAYYWaHR0cDovL29jc3AuY2FjZXJ0Lm9yZzCBjgYDVR0RBIGGMIGDgRNkd213 MkBpbmZyYWRlYWQub3JngRBkYXZpZEB3b29kaG91LnNlgRlkYXZpZC53b29kaG91c2VAaW50ZWwu Y29tgRVkd213MkBsaW51eC5pbnRlbC5jb22BKDEwODcyYTA3ZjZkN2UxZTA3ZjU1ZmYxNzJhMDNi MzAwZWVhYWQyMDMwDQYJKoZIhvcNAQEFBQADggIBAF5vklDtf00nhiStA/aQJhPS0xZHZYG2g+h1 xm0tEzVA8nyxZGnHNhdSS6FnKBcHC+kbqeaP0beEGAwT1oBfRFxb6rHPUi60nl+lcEY+7yONMdfU 4RNgNWPA8wSfftjMyEeoXeZ/WsQEwjiEYZmVY19XEZMLIRBrwJ/Jk2BoVrbZMVoQXGgLgnfTjkKl MH8U1F4kn1bpj1Da627r2h+jI6zYw613b4nC9umPgMxUiZ96PA0oY4zIZFMfZaleOgaY0hiLr5B4 XC5Bid2NWJrTl9YcE/mfnf9dFiYfGRthaiJSbT7arxyuaJfyr3czMJjAXeKhY2ADt9r3+83Xvo3U xzadjG9eWyR4TXRjrGYnKRrnuNn4N3XmUBXtRNigZfVTtPX453I7fWHYQlLcTm7g56DosWOmEiYE phiQdl7PkxOYKbOFIojmHp/jXiZLsIOcfb5sq2lNOtVHNHLH3PxOSKMYU1/z3B/s14hEfGkowP/T F0H6yTNsZGOlDSpQ2wmEiypx/ztNnrux5mupQeMLXGPBAruyybhWNuOPELqJb0kH0C0bymrhhRlA IWzwpTsTm7r/3zcwPpX4PA19suY1w7rZ6bwRoLKZSsaGodNUmX0fczasaHT8drKyobowTQflogGZ 7TH9MaeHtCTzJUxcZt7W2PcLgUskycrnjvYVJGzeMIIHWTCCBUGgAwIBAgIDCkGKMA0GCSqGSIb3 DQEBCwUAMHkxEDAOBgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9y ZzEiMCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJARYSc3Vw cG9ydEBjYWNlcnQub3JnMB4XDTExMDUyMzE3NDgwMloXDTIxMDUyMDE3NDgwMlowVDEUMBIGA1UE ChMLQ0FjZXJ0IEluYy4xHjAcBgNVBAsTFWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMT Q0FjZXJ0IENsYXNzIDMgUm9vdDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAKtJNRFI fNImflOUz0Op3SjXQiqL84d4GVh8D57aiX3h++tykA10oZZkq5+gJJlz2uJVdscXe/UErEa4w75/ ZI0QbCTzYZzA8pD6Ueb1aQFjww9W4kpCz+JEjCUoqMV5CX1GuYrz6fM0KQhF5Byfy5QEHIGoFLOY ZcRD7E6CjQnRvapbjZLQ7N6QxX8KwuPr5jFaXnQ+lzNZ6MMDPWAzv/fRb0fEze5ig1JuLgiapNkV GJGmhZJHsK5I6223IeyFGmhyNav/8BBdwPSUp2rVO5J+TJAFfpPBLIukjmJ0FXFuC3ED6q8VOJrU 0gVyb4z5K+taciX5OUbjchs+BMNkJyIQKopPWKcDrb60LhPtXapI19V91Cp7XPpGBFDkzA5CW4zt 2/LP/JaT4NsRNlRiNDiPDGCbO5dWOK3z0luLoFvqTpa4fNfVoIZwQNORKbeiPK31jLvPGpKK5DR7 wNhsX+kKwsOnIJpa3yxdUly6R9Wb7yQocDggL9V/KcCyQQNokszgnMyXS0XvOhAKq3A6mJVwrTWx 6oUrpByAITGprmB6gCZIALgBwJNjVSKRPFbnr9s6JfOPMVTqJouBWfmh0VMRxXudA/Z0EeBtsSw/ LIaRmXGapneLNGDRFLQsrJ2vjBDTn8Rq+G8T/HNZ92ZCdB6K4/jc0m+YnMtHmJVABfvpAgMBAAGj ggINMIICCTAdBgNVHQ4EFgQUdahxYEyIE/B42Yl3tW3Fid+8sXowgaMGA1UdIwSBmzCBmIAUFrUy G9TH8+DmjvO90rA67rI5GNGhfaR7MHkxEDAOBgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6 Ly93d3cuY2FjZXJ0Lm9yZzEiMCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8G CSqGSIb3DQEJARYSc3VwcG9ydEBjYWNlcnQub3JnggEAMA8GA1UdEwEB/wQFMAMBAf8wXQYIKwYB BQUHAQEEUTBPMCMGCCsGAQUFBzABhhdodHRwOi8vb2NzcC5DQWNlcnQub3JnLzAoBggrBgEFBQcw AoYcaHR0cDovL3d3dy5DQWNlcnQub3JnL2NhLmNydDBKBgNVHSAEQzBBMD8GCCsGAQQBgZBKMDMw MQYIKwYBBQUHAgEWJWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZy9pbmRleC5waHA/aWQ9MTAwNAYJYIZI AYb4QgEIBCcWJWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZy9pbmRleC5waHA/aWQ9MTAwUAYJYIZIAYb4 QgENBEMWQVRvIGdldCB5b3VyIG93biBjZXJ0aWZpY2F0ZSBmb3IgRlJFRSwgZ28gdG8gaHR0cDov L3d3dy5DQWNlcnQub3JnMA0GCSqGSIb3DQEBCwUAA4ICAQApKIWuRKm5r6R5E/CooyuXYPNc7uMv wfbiZqARrjY3OnYVBFPqQvX56sAV2KaC2eRhrnILKVyQQ+hBsuF32wITRHhHVa9Y/MyY9kW50SD4 2CEH/m2qc9SzxgfpCYXMO/K2viwcJdVxjDm1Luq+GIG6sJO4D+Pm1yaMMVpyA4RS5qb1MyJFCsgL DYq4Nm+QCaGrvdfVTi5xotSu+qdUK+s1jVq3VIgv7nSf7UgWyg1I0JTTrKSi9iTfkuO960NAkW4c GI5WtIIS86mTn9S8nK2cde5alxuV53QtHA+wLJef+6kzOXrnAzqSjiL2jA3k2X4Ndhj3Afnvlpai VXPAPHG0HRpWQ7fDCo1y/OIQCQtBzoyUoPkD/XFzS4pXM+WOdH4VAQDmzEoc53+VGS3FpQyLu7Xt hbNc09+4ufLKxw0BFKxwWMWMjTPUnWajGlCVI/xI4AZDEtnNp4Y5LzZyo4AQ5OHz0ctbGsDkgJp8 E3MGT9ujayQKurMcvEp4u+XjdTilSKeiHq921F73OIZWWonO1sOnebJSoMbxhbQljPI/lrMQ2Y1s Vzufb4Y6GIIiNsiwkTjbKqGTqoQ/9SdlrnPVyNXTd+pLncdBu8fA46A/5H2kjXPmEkvfoXNzczqA 6NXLji/L6hOn1kGLrPo8idck9U604GGSt/M3mMS+lqO3ijGCAr0wggK5AgEBMFswVDEUMBIGA1UE ChMLQ0FjZXJ0IEluYy4xHjAcBgNVBAsTFWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMT Q0FjZXJ0IENsYXNzIDMgUm9vdAIDAK05MAkGBSsOAwIaBQCgggE3MBgGCSqGSIb3DQEJAzELBgkq hkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTExMTExMjAxMjA0MVowIwYJKoZIhvcNAQkEMRYEFJSN A2qXrUD1BrJepvvI5mpbsT1+MGoGCSsGAQQBgjcQBDFdMFswVDEUMBIGA1UEChMLQ0FjZXJ0IElu Yy4xHjAcBgNVBAsTFWh0dHA6Ly93d3cuQ0FjZXJ0Lm9yZzEcMBoGA1UEAxMTQ0FjZXJ0IENsYXNz IDMgUm9vdAIDAK05MGwGCyqGSIb3DQEJEAILMV2gWzBUMRQwEgYDVQQKEwtDQWNlcnQgSW5jLjEe MBwGA1UECxMVaHR0cDovL3d3dy5DQWNlcnQub3JnMRwwGgYDVQQDExNDQWNlcnQgQ2xhc3MgMyBS b290AgMArTkwDQYJKoZIhvcNAQEBBQAEggEAXBWPAhbE4uMqsKBs9NDTkQilTeFMx0UCxM7gHSVa Ev5jfFLcdzMHC3IrF8JUUTgNr1NtcoFI/68tdTso/t0Ims4JtiQ59REIlQHxQosT809C56k3pKA1 QDH92D/Y55ooYt6JCH5o0OzHAp6zCSrInh6bpQlXKqSd54ocn7AnMdRq98rAtssQCNsTnmW5Rr2n cIFujL+2LLAOT1K7l17i/S0TifAvJ54VZGyZp21E54aBrRxlmh1T//+JHUXiSDfZt+3VdHuMmD/p 9dEPCB8GG6qfNcvcDtJxizOPtoTrWV6g1cmmU3s4WyJpDGy7fkNymrJyf+qr3/hZV5FssXozoQAA AAAAAA== --=-s6s7aD8oiSJsRQJuDIHQ--