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    Subject[PATCH 4/5] VFIO: platform: populate reset function according to compat
    Date
    Add the reset function lookup according to the device compat
    string. This lookup is added at different places:
    - on VFIO_DEVICE_GET_INFO
    - on VFIO_DEVICE_RESET
    - on device release

    A reference to the module implementing the reset function is taken
    on first reset function lookup and released on vfio platform device
    release.

    Signed-off-by: Eric Auger <eric.auger@linaro.org>
    ---
    drivers/vfio/platform/vfio_platform_common.c | 50 ++++++++++++++++++++++++++++
    1 file changed, 50 insertions(+)

    diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
    index 0d10018..bd7e44c 100644
    --- a/drivers/vfio/platform/vfio_platform_common.c
    +++ b/drivers/vfio/platform/vfio_platform_common.c
    @@ -28,6 +28,52 @@ LIST_HEAD(reset_list);

    static DEFINE_MUTEX(driver_lock);

    +static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat)
    +{
    + struct vfio_platform_reset_node *iter;
    +
    + list_for_each_entry(iter, &reset_list, link) {
    + if (!strcmp(iter->compat, compat) &&
    + try_module_get(iter->owner))
    + return iter->reset;
    + }
    +
    + return ERR_PTR(-ENODEV);
    +}
    +
    +static vfio_platform_reset_fn_t vfio_platform_get_reset(
    + struct vfio_platform_device *vdev)
    +{
    + struct device *dev = vdev->get_device(vdev);
    + const char *compat_str_array[2];
    + vfio_platform_reset_fn_t reset;
    + int ret;
    +
    + if (!IS_ERR_OR_NULL(vdev->reset))
    + return vdev->reset;
    +
    + ret = device_property_read_string_array(dev, "compatible",
    + compat_str_array, 2);
    + if (!ret)
    + return ERR_PTR(ret);
    +
    + reset = vfio_platform_lookup_reset(compat_str_array[0]);
    + return reset;
    +}
    +
    +static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
    +{
    + struct vfio_platform_reset_node *iter;
    +
    + list_for_each_entry(iter, &reset_list, link) {
    + if (iter->reset == vdev->reset) {
    + module_put(iter->owner);
    + vdev->reset = NULL;
    + return;
    + }
    + }
    +}
    +
    static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
    {
    int cnt = 0, i;
    @@ -103,10 +149,12 @@ static void vfio_platform_release(void *device_data)
    mutex_lock(&driver_lock);

    if (!(--vdev->refcnt)) {
    + vdev->reset = vfio_platform_get_reset(vdev);
    if (!IS_ERR_OR_NULL(vdev->reset))
    vdev->reset(vdev);
    vfio_platform_regions_cleanup(vdev);
    vfio_platform_irq_cleanup(vdev);
    + vfio_platform_put_reset(vdev);
    }

    mutex_unlock(&driver_lock);
    @@ -164,6 +212,7 @@ static long vfio_platform_ioctl(void *device_data,
    if (info.argsz < minsz)
    return -EINVAL;

    + vdev->reset = vfio_platform_get_reset(vdev);
    if (!IS_ERR_OR_NULL(vdev->reset))
    vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
    info.flags = vdev->flags;
    @@ -260,6 +309,7 @@ static long vfio_platform_ioctl(void *device_data,
    return ret;

    } else if (cmd == VFIO_DEVICE_RESET) {
    + vdev->reset = vfio_platform_get_reset(vdev);
    if (!IS_ERR_OR_NULL(vdev->reset))
    return vdev->reset(vdev);
    else
    --
    1.9.1


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