From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752978AbdI0NRs (ORCPT ); Wed, 27 Sep 2017 09:17:48 -0400 Received: from casper.infradead.org ([85.118.1.10]:41724 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751959AbdI0NRq (ORCPT ); Wed, 27 Sep 2017 09:17:46 -0400 X-Greylist: delayed 1101 seconds by postgrey-1.27 at vger.kernel.org; Wed, 27 Sep 2017 09:17:46 EDT Message-ID: <1506517162.30379.2.camel@infradead.org> Subject: [PATCH] uio/uio_pci_generic: Add SR-IOV support From: David Woodhouse To: Greg Kroah-Hartman , linux-pci , linux-kernel Date: Wed, 27 Sep 2017 13:59:22 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-rNZY0+1pAO+mFup16fUc" X-Mailer: Evolution 3.22.6 (3.22.6-2.fc25) 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 --=-rNZY0+1pAO+mFup16fUc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Allow userspace to configure SR-IOV VFs through sysfs. Currently, we need an in-kernel driver to permit this. But sometimes *all* we want to do is enable the VFs so that we can assign them to guests; we don't actually need to deal with the PF in any other way from the host kernel. So let's make it possible to use UIO for that. Signed-off-by: David Woodhouse --- It's not entirely clear to me why we require the driver to "enable" SR-IOV like this anyway =E2=80=94 were there some which needed to do someth= ing special and device-specific instead of just falling through to pci_{en,dis}able_sriov(), such that we need to effectively whitelist this in the driver rather than blacklisting the "problematic" ones via PCI quirks? drivers/uio/uio_pci_generic.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c index a56fdf9..bd196f0 100644 --- a/drivers/uio/uio_pci_generic.c +++ b/drivers/uio/uio_pci_generic.c @@ -108,15 +108,27 @@ static void remove(struct pci_dev *pdev) struct uio_pci_generic_dev *gdev =3D pci_get_drvdata(pdev); =20 uio_unregister_device(&gdev->info); + pci_disable_sriov(pdev); pci_disable_device(pdev); kfree(gdev); } =20 +static int sriov_configure(struct pci_dev *pdev, int num_vfs) +{ + if (!num_vfs) { + pci_disable_sriov(pdev); + return 0; + } + + return pci_enable_sriov(pdev, num_vfs); +} + static struct pci_driver uio_pci_driver =3D { .name =3D "uio_pci_generic", .id_table =3D NULL, /* only dynamic id's */ .probe =3D probe, .remove =3D remove, + .sriov_configure =3D sriov_configure, }; =20 module_pci_driver(uio_pci_driver); --=20 2.7.4 --=20 dwmw2 --=-rNZY0+1pAO+mFup16fUc 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 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