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    Subject[PATCH 4/5] PCI: Add max_vfs in sysfs per pci device where supports
    Date
    only pci device that support sriov will have max_vfs show up in /sys

    when user set value in /sys, driver ops set_max_vfs will be called to enable
    VF there.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    drivers/pci/pci-sysfs.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++
    include/linux/pci.h | 1 +
    2 files changed, 52 insertions(+), 0 deletions(-)

    diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
    index fbbb97f..9b6f409 100644
    --- a/drivers/pci/pci-sysfs.c
    +++ b/drivers/pci/pci-sysfs.c
    @@ -458,6 +458,52 @@ boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
    }
    struct device_attribute vga_attr = __ATTR_RO(boot_vga);

    +static ssize_t
    +max_vfs_show(struct device *dev, struct device_attribute *attr, char *buf)
    +{
    + struct pci_dev *pdev = to_pci_dev(dev);
    +
    + return sprintf(buf, "%u\n", pdev->max_vfs);
    +}
    +
    +static void max_vfs_callback(struct device *dev)
    +{
    + struct pci_dev *pdev = to_pci_dev(dev);
    +
    + mutex_lock(&pci_remove_rescan_mutex);
    + if (pdev->is_added && dev->driver) {
    + struct pci_driver *pdrv;
    +
    + pdrv = to_pci_driver(dev->driver);
    + if (pdrv->set_max_vfs)
    + pdrv->set_max_vfs(pdev);
    +
    + }
    + mutex_unlock(&pci_remove_rescan_mutex);
    +}
    +static ssize_t
    +max_vfs_store(struct device *dev, struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + unsigned long val;
    + int err;
    + struct pci_dev *pdev = to_pci_dev(dev);
    +
    + if (kstrtoul(buf, 0, &val) < 0)
    + return -EINVAL;
    +
    + pdev->max_vfs = val;
    +
    + err = device_schedule_callback(dev, max_vfs_callback);
    +
    + if (err)
    + return err;
    +
    + return count;
    +}
    +struct device_attribute max_vfs_attr =
    + __ATTR(max_vfs, 0644, max_vfs_show, max_vfs_store);
    +
    static void
    pci_config_pm_runtime_get(struct pci_dev *pdev)
    {
    @@ -1405,6 +1451,7 @@ late_initcall(pci_sysfs_init);

    static struct attribute *pci_dev_dev_attrs[] = {
    &vga_attr.attr,
    + &max_vfs_attr.attr,
    NULL,
    };

    @@ -1418,6 +1465,10 @@ static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
    if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
    return 0;

    + if (a == &max_vfs_attr.attr)
    + if (!pdev->is_physfn)
    + return 0;
    +
    return a->mode;
    }

    diff --git a/include/linux/pci.h b/include/linux/pci.h
    index 7d70a5e..f7423d4 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -335,6 +335,7 @@ struct pci_dev {
    unsigned int broken_intx_masking:1;
    unsigned int io_window_1k:1; /* Intel P2P bridge 1K I/O windows */
    pci_dev_flags_t dev_flags;
    + unsigned int max_vfs;
    atomic_t enable_cnt; /* pci_enable_device has been called */

    u32 saved_config_space[16]; /* config space saved at suspend time */
    --
    1.7.7


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