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Thu, 04 Jun 2026 08:02:08 -0700 (PDT) From: Dimitri Daskalakis To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Mahesh J Salgaonkar , Oliver O'Halloran , Niklas Schnelle , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alex Williamson , Jason Gunthorpe , Kevin Tian , Ankit Agrawal , Leon Romanovsky , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Keith Busch , Alexander Duyck , Jakub Kicinski , Dimitri Daskalakis , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Subject: [RFC 09/12] PCI: Add helper to compute VF Routing ID to pci.h Date: Thu, 4 Jun 2026 08:01:50 -0700 Message-ID: <20260604150153.3619662-10-dimitri.daskalakis1@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260604150153.3619662-1-dimitri.daskalakis1@gmail.com> References: <20260604150153.3619662-1-dimitri.daskalakis1@gmail.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Dimitri Daskalakis The VF RID computation is identical for SR-IOV and SIOV. Add a common helper so we can share the logic across both. No functional changes. Assisted-by: Claude:claude-opus-4.7 Signed-off-by: Dimitri Daskalakis --- drivers/pci/iov.c | 8 ++++---- drivers/pci/pci.h | 12 ++++++++++++ 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 4aed4f6a42c3..5d65413ce98d 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -25,16 +25,16 @@ int pci_iov_virtfn_bus(struct pci_dev *dev, int vf_id) { if (!pci_is_sriov_physfn(dev)) return -EINVAL; - return dev->bus->number + ((dev->devfn + dev->sriov->offset + - dev->sriov->stride * vf_id) >> 8); + return pci_virtfn_routing_id(dev, dev->sriov->offset, + dev->sriov->stride, vf_id) >> 8; } int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) { if (!pci_is_sriov_physfn(dev)) return -EINVAL; - return (dev->devfn + dev->sriov->offset + - dev->sriov->stride * vf_id) & 0xff; + return pci_virtfn_routing_id(dev, dev->sriov->offset, + dev->sriov->stride, vf_id) & 0xff; } EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 73b913bcb87a..45411960fd2e 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -1017,6 +1017,18 @@ static inline int pci_resource_num_to_vf_bar(int resno) } #endif /* CONFIG_PCI_IOV */ +#if defined(CONFIG_PCI_IOV) || defined(CONFIG_PCI_SIOV) +/* + * Compute the Routing ID (bus/devfn) for a VF or SDI under @pf, given the + * capability's offset and stride. + */ +static inline u16 pci_virtfn_routing_id(struct pci_dev *pf, u16 offset, + u16 stride, int id) +{ + return (pf->bus->number << 8) + pf->devfn + offset + stride * id; +} +#endif + #ifdef CONFIG_PCIE_TPH void pci_restore_tph_state(struct pci_dev *dev); void pci_save_tph_state(struct pci_dev *dev); -- 2.52.0