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    Subject[PATCH v3 3/9] s390: ap: new vfio_ap_queue structure
    Date
    The AP interruptions are assigned on a queue basis
    and we need some information neloging to the queue
    to handle interuptions.

    We add a new structure vfio_ap_queue, to hold per
    queue information useful to handle interruptions.

    - apqn: AP queue number (defined here)
    - isc : Interrupt subclass (defined later)
    - nib : notification information byte (defined later)

    The vfio_ap_queue structure is allocated when the vfio_ap_driver
    is probed and added as driver data to the ap_queue device.
    It is free on remove.

    The structure is linked to the matrix_dev host device.

    Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
    Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
    ---
    drivers/s390/crypto/vfio_ap_drv.c | 23 ++++++++++++++++++++++-
    drivers/s390/crypto/vfio_ap_private.h | 3 +++
    2 files changed, 25 insertions(+), 1 deletion(-)

    diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
    index 1fd5fe6..03153e6 100644
    --- a/drivers/s390/crypto/vfio_ap_drv.c
    +++ b/drivers/s390/crypto/vfio_ap_drv.c
    @@ -46,14 +46,35 @@ static struct ap_device_id ap_queue_ids[] = {

    MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);

    +/**
    + * vfio_ap_queue_dev_probe:
    + *
    + * Allocate a vfio_ap_queue structure and associate it
    + * with the device as driver_data.
    + */
    static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
    {
    + struct vfio_ap_queue *q;
    +
    + q = kzalloc(sizeof(*q), GFP_KERNEL);
    + if (!q)
    + return -ENOMEM;
    + dev_set_drvdata(&apdev->device, q);
    + q->apqn = to_ap_queue(&apdev->device)->qid;
    return 0;
    }

    +/**
    + * vfio_ap_queue_dev_remove:
    + *
    + * Free the associated vfio_ap_queue structure
    + */
    static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
    {
    - /* Nothing to do yet */
    + struct vfio_ap_queue *q;
    +
    + q = dev_get_drvdata(&apdev->device);
    + kfree(q);
    }

    static void vfio_ap_matrix_dev_release(struct device *dev)
    diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
    index 76b7f98..8836f01 100644
    --- a/drivers/s390/crypto/vfio_ap_private.h
    +++ b/drivers/s390/crypto/vfio_ap_private.h
    @@ -86,4 +86,7 @@ struct ap_matrix_mdev {
    extern int vfio_ap_mdev_register(void);
    extern void vfio_ap_mdev_unregister(void);

    +struct vfio_ap_queue {
    + int apqn;
    +};
    #endif /* _VFIO_AP_PRIVATE_H_ */
    --
    2.7.4
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