From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from twosheds.infradead.org ([90.155.92.209]:49280 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751430AbdEDKVy (ORCPT ); Thu, 4 May 2017 06:21:54 -0400 Message-ID: <1493893297.4904.71.camel@infradead.org> Subject: Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs From: David Woodhouse To: "Deucher, Alexander" , 'Joerg Roedel' , Bjorn Helgaas Cc: "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Daniel Drake , Samuel Sieb , Joerg Roedel In-Reply-To: References: <1491575538-22694-1-git-send-email-joro@8bytes.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-hykz689SVM4PUsrwsgkn" Date: Thu, 04 May 2017 12:21:37 +0200 Mime-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org List-ID: --=-hykz689SVM4PUsrwsgkn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2017-04-07 at 16:46 +0000, Deucher, Alexander wrote: > >=20 > > -----Original Message----- > > From: Joerg Roedel [mailto:joro@8bytes.org] > > Sent: Friday, April 07, 2017 10:32 AM > > To: Bjorn Helgaas > > Cc: linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org; Daniel Dra= ke; > > Deucher, Alexander; Samuel Sieb; David Woodhouse; Joerg Roedel > > Subject: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs > >=20 > > From: Joerg Roedel > >=20 > > ATS is broken on this hardware and causes IOMMU stalls and > > system failure. Disable ATS on these devices to make them > > usable again with IOMMU enabled. > >=20 > > Note that the commit in the Fixes-tag is not buggy, it > > just uncovers the problem in the hardware by increasing > > the ATS-flush rate. > >=20 > > Fixes: b1516a14657a ('iommu/amd: Implement flush queue') > > Signed-off-by: Joerg Roedel > Acked-by: Alex Deucher Alex, are you able to confirm that it is *only* the device with PCI ID 0x98e4 which has this problem, or (more likely) come up with an exhaustive list? Thanks. We'll want the same blacklist in Xen too, won't we? > >=20 > > --- > > =C2=A0drivers/pci/quirks.c | 19 +++++++++++++++++++ > > =C2=A01 file changed, 19 insertions(+) > >=20 > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > > index 6736836..7cbe316 100644 > > --- a/drivers/pci/quirks.c > > +++ b/drivers/pci/quirks.c > > @@ -4634,3 +4634,22 @@ static void quirk_no_aersid(struct pci_dev *pdev= ) > > =C2=A0DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2031, > > quirk_no_aersid); > > =C2=A0DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2032, > > quirk_no_aersid); > > =C2=A0DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2033, > > quirk_no_aersid); > > + > > +#ifdef CONFIG_PCI_ATS > > +/* > > + * Some devices have a broken ATS implementation causing IOMMU stalls. > > + * Don't use ATS for those devices. > > + */ > > +static void quirk_disable_ats(struct pci_dev *pdev) > > +{ > > + /* > > + =C2=A0* Set pdev->ats_cap =3D 0 to make pci_enable_ats() bail out > > + =C2=A0* early. > > + =C2=A0*/ > > + dev_info(&pdev->dev, "QUIRK: Disabling ATS"); > > + pdev->ats_cap =3D 0; > > +} > > + > > +/* AMD Stoney platform GPU */ > > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_disable_ats); > > +#endif /* CONFIG_PCI_ATS */ > > -- > > 1.9.1 --=-hykz689SVM4PUsrwsgkn Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDzUw ggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQswCQYDVQQG EwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRU UCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTE0MTIyMjAw MDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1h bmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMUEw PwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBF 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