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    Subject[PATCH 1/2] pci: Cache the VF device ID in the SR-IOV structure
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    ... and use it instead of reading it over and over from the PF config
    space capability.

    Signed-off-by: Filippo Sironi <sironi@amazon.de>
    Cc: linux-pci@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    ---
    drivers/pci/iov.c | 5 +++--
    drivers/pci/pci.h | 1 +
    2 files changed, 4 insertions(+), 2 deletions(-)

    diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
    index 120485d6f352..e8f7eafaba6a 100644
    --- a/drivers/pci/iov.c
    +++ b/drivers/pci/iov.c
    @@ -134,7 +134,7 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)

    virtfn->devfn = pci_iov_virtfn_devfn(dev, id);
    virtfn->vendor = dev->vendor;
    - pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_DID, &virtfn->device);
    + virtfn->device = iov->vf_did;
    rc = pci_setup_device(virtfn);
    if (rc)
    goto failed0;
    @@ -448,6 +448,7 @@ static int sriov_init(struct pci_dev *dev, int pos)
    iov->nres = nres;
    iov->ctrl = ctrl;
    iov->total_VFs = total;
    + pci_read_config_word(dev, pos + PCI_SRIOV_VF_DID, &iov->vf_did);
    iov->pgsz = pgsz;
    iov->self = dev;
    iov->drivers_autoprobe = true;
    @@ -723,7 +724,7 @@ int pci_vfs_assigned(struct pci_dev *dev)
    * determine the device ID for the VFs, the vendor ID will be the
    * same as the PF so there is no need to check for that one
    */
    - pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
    + dev_id = dev->sriov->vf_did;

    /* loop through all the VFs to see if we own any that are assigned */
    vfdev = pci_get_device(dev->vendor, dev_id, NULL);
    diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
    index 22e061738c6f..a7270e11e1ef 100644
    --- a/drivers/pci/pci.h
    +++ b/drivers/pci/pci.h
    @@ -262,6 +262,7 @@ struct pci_sriov {
    u16 num_VFs; /* number of VFs available */
    u16 offset; /* first VF Routing ID offset */
    u16 stride; /* following VF stride */
    + u16 vf_did; /* VF device ID */
    u32 pgsz; /* page size for BAR alignment */
    u8 link; /* Function Dependency Link */
    u8 max_VF_buses; /* max buses consumed by VFs */
    --
    2.7.4
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