From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH v4 3/6] PCI: Add support for multiple DMA aliases Date: Mon, 14 Mar 2016 22:43:40 +0000 Message-ID: <1457995420.78634.63.camel@infradead.org> References: <20160224193926.7585.10833.stgit@bhelgaas-glaptop2.roam.corp.google.com> <20160224194406.7585.17447.stgit@bhelgaas-glaptop2.roam.corp.google.com> <20160225143841.GA8726@localhost> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-pboz+VVWuuUb5b2tcW94" Return-path: In-Reply-To: <20160225143841.GA8726@localhost> Sender: linux-pci-owner@vger.kernel.org To: Bjorn Helgaas , Bjorn Helgaas , "Lawrynowicz, Jacek" Cc: Joerg Roedel , linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org List-Id: iommu@lists.linux-foundation.org --=-pboz+VVWuuUb5b2tcW94 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2016-02-25 at 08:38 -0600, Bjorn Helgaas wrote: >=20 > >=C2=A0 /* > > - * Look for aliases to or from the given device for exisiting groups.= =C2=A0 The > > - * dma_alias_devfn only supports aliases on the same bus, therefore th= e search > > + * Look for aliases to or from the given device for existing groups. D= MA > > + * aliases are only supported on the same bus, therefore the search >=20 > I'm trying to reconcile this statement that "DMA aliases are only > supported on the same bus" (which was there even before this patch) > with the fact that pci_for_each_dma_alias() does not have that > limitation. Doesn't it? You can still only set a DMA alias on the same bus with pci_add_dma_alias(), can't you? > >=C2=A0=C2=A0 * space is quite small (especially since we're really only = looking at pcie > >=C2=A0=C2=A0 * device, and therefore only expect multiple slots on the r= oot complex or > >=C2=A0=C2=A0 * downstream switch ports).=C2=A0 It's conceivable though t= hat a pair of > > @@ -686,11 +692,8 @@ static struct iommu_group *get_pci_alias_group(str= uct pci_dev *pdev, > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0continue; > >=C2=A0=C2=A0 > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0/* We alias them or they alias us */ > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0if (((pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN) && > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 pdev->dma_alias_devfn =3D=3D tmp->devfn) = || > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 ((tmp->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVF= N) && > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tmp->dma_alias_devfn =3D=3D pdev->devfn))= { > > - > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0if (dma_alias_is_enabled(pdev, tmp->devfn) || > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 dma_alias_is_enabled(tmp, pdev->devfn)) { > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0group =3D= get_pci_alias_group(tmp, devfns); >=20 > We basically have this: >=20 > =C2=A0 for_each_pci_dev(tmp) { > =C2=A0=C2=A0=C2=A0 if () > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 group =3D get_pci_alias_group(); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ... > =C2=A0 } Strictly, that's: =C2=A0for_each_pci_dev(tmp) { =C2=A0 =C2=A0if (pdev is an alias of tmp || tmp is an alias of pdev) =C2=A0 =C2=A0 =C2=A0group =3D get_pci_alias_group(); =C2=A0 =C2=A0... =C2=A0} > The DMA alias stuff relies on PCI internals, so it doesn't doesn't > seem quite right to use things like PCI_DEV_FLAGS_DMA_ALIAS_DEVFN and > dma_alias_devfn here in the IOMMU code.=C2=A0=C2=A0 > > I'm trying to figure out why we don't do something like the following > instead: >=20 > =C2=A0 callback(struct pci_dev *pdev, u16 alias, void *opaque) > =C2=A0 { > =C2=A0=C2=A0=C2=A0 struct iommu_group *group; >=20 > =C2=A0=C2=A0=C2=A0 group =3D get_pci_alias_group(); > =C2=A0=C2=A0=C2=A0 if (group) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return group; >=20 > =C2=A0=C2=A0=C2=A0 return 0; > =C2=A0 } >=20 > =C2=A0 pci_for_each_dma_alias(pdev, callback, ...); And this would be equivalent to =C2=A0for_each_pci_dev(tmp) { =C2=A0 =C2=A0if (tmp is an alias of pdev) =C2=A0 =C2=A0 =C2=A0group =3D get_pci_alias_group(); =C2=A0 =C2=A0... =C2=A0} The "is an alias of" property is not commutative. Perhaps it should be. But that's hard because in some cases the alias doesn't even *exist* as a real PCI device. It's just that you appear to get DMA transactions from a given source-id. --=C2=A0 dwmw2 --=-pboz+VVWuuUb5b2tcW94 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 AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG doa5RY7+N4WRusWZDYW/RRWE6i9EL9qV86CVPYqw22UBOUw4/j/HVGCV6TSB8yE5iEwhk/hUuzRr 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