From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.9]:48355 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965221AbcAZPHH (ORCPT ); Tue, 26 Jan 2016 10:07:07 -0500 Message-ID: <1453820823.60902.69.camel@infradead.org> Subject: Re: [PATCH v2 1/2] pci: Add support for multiple DMA aliases From: David Woodhouse To: Jacek Lawrynowicz , linux-pci@vger.kernel.org Cc: bhelgaas@google.com, alex.williamson@redhat.com, jroedel@suse.de Date: Tue, 26 Jan 2016 15:07:03 +0000 In-Reply-To: <1453819940-100605-1-git-send-email-jacek.lawrynowicz@intel.com> References: <20160126143418.GA9279@localhost> <1453819940-100605-1-git-send-email-jacek.lawrynowicz@intel.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-V+bLFXj/Zhrjp0ppwEyo" Mime-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org List-ID: --=-V+bLFXj/Zhrjp0ppwEyo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2016-01-26 at 15:52 +0100, Jacek Lawrynowicz wrote: > This patch solves IOMMU support issues with PCIe non-transparent bridges > that use Requester ID look-up tables (LUT), e.g. PEX8733. Before exiting > the bridge, packet's RID is rewritten according to LUT programmed by > a driver. Modified packets are then passed to a destination bus and > processed upstream. The problem is that such packets seem to come from > non-existent nodes that are hidden behind NTB and are not discoverable > by a destination node, so IOMMU discards them. Adding DMA alias for a > given LUT entry allows IOMMU to create a proper mapping that enables > inter-node communication. >=20 > The current DMA alias implementation supports only single alias, so it's > not possible to connect more than two nodes when IOMMU is enabled. This > implementation enables all possible aliases on a given bus (256) that > are stored in a bitset. Alias devfn is directly translated to a bit > number. The bitset is not allocated for devices that have no need for > DMA aliases. >=20 > More details can be found in following article: > http://www.plxtech.com/files/pdf/technical/expresslane/RTC_Enabling%20Mul= itHostSystemDesigns.pdf >=20 > Signed-off-by: Jacek Lawrynowicz Acked-By: David Woodhouse ... for both. --=20 dwmw2 --=-V+bLFXj/Zhrjp0ppwEyo Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN 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