diff options
Diffstat (limited to 'drivers/s390/crypto/vfio_ap_private.h')
| -rw-r--r-- | drivers/s390/crypto/vfio_ap_private.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h new file mode 100644 index 000000000..976a65f32 --- /dev/null +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -0,0 +1,158 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Private data and functions for adjunct processor VFIO matrix driver. + * + * Author(s): Tony Krowiak <akrowiak@linux.ibm.com> + * Halil Pasic <pasic@linux.ibm.com> + * Pierre Morel <pmorel@linux.ibm.com> + * + * Copyright IBM Corp. 2018 + */ + +#ifndef _VFIO_AP_PRIVATE_H_ +#define _VFIO_AP_PRIVATE_H_ + +#include <linux/types.h> +#include <linux/mdev.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/kvm_host.h> +#include <linux/vfio.h> +#include <linux/hashtable.h> + +#include "ap_bus.h" + +#define VFIO_AP_MODULE_NAME "vfio_ap" +#define VFIO_AP_DRV_NAME "vfio_ap" + +/** + * struct ap_matrix_dev - Contains the data for the matrix device. + * + * @device: generic device structure associated with the AP matrix device + * @info: the struct containing the output from the PQAP(QCI) instruction + * @mdev_list: the list of mediated matrix devices created + * @mdevs_lock: mutex for locking the AP matrix device. This lock will be + * taken every time we fiddle with state managed by the vfio_ap + * driver, be it using @mdev_list or writing the state of a + * single ap_matrix_mdev device. It's quite coarse but we don't + * expect much contention. + * @vfio_ap_drv: the vfio_ap device driver + * @guests_lock: mutex for controlling access to a guest that is using AP + * devices passed through by the vfio_ap device driver. This lock + * will be taken when the AP devices are plugged into or unplugged + * from a guest, and when an ap_matrix_mdev device is added to or + * removed from @mdev_list or the list is iterated. + */ +struct ap_matrix_dev { + struct device device; + struct ap_config_info info; + struct list_head mdev_list; + struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */ + struct ap_driver *vfio_ap_drv; + struct mutex guests_lock; /* serializes access to each KVM guest */ + struct mdev_parent parent; + struct mdev_type mdev_type; + struct mdev_type *mdev_types[1]; +}; + +extern struct ap_matrix_dev *matrix_dev; + +/** + * struct ap_matrix - matrix of adapters, domains and control domains + * + * @apm_max: max adapter number in @apm + * @apm: identifies the AP adapters in the matrix + * @aqm_max: max domain number in @aqm + * @aqm: identifies the AP queues (domains) in the matrix + * @adm_max: max domain number in @adm + * @adm: identifies the AP control domains in the matrix + * + * The AP matrix is comprised of three bit masks identifying the adapters, + * queues (domains) and control domains that belong to an AP matrix. The bits in + * each mask, from left to right, correspond to IDs 0 to 255. When a bit is set + * the corresponding ID belongs to the matrix. + */ +struct ap_matrix { + unsigned long apm_max; + DECLARE_BITMAP(apm, 256); + unsigned long aqm_max; + DECLARE_BITMAP(aqm, 256); + unsigned long adm_max; + DECLARE_BITMAP(adm, 256); +}; + +/** + * struct ap_queue_table - a table of queue objects. + * + * @queues: a hashtable of queues (struct vfio_ap_queue). + */ +struct ap_queue_table { + DECLARE_HASHTABLE(queues, 8); +}; + +/** + * struct ap_matrix_mdev - Contains the data associated with a matrix mediated + * device. + * @vdev: the vfio device + * @node: allows the ap_matrix_mdev struct to be added to a list + * @matrix: the adapters, usage domains and control domains assigned to the + * mediated matrix device. + * @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB + * @kvm: the struct holding guest's state + * @pqap_hook: the function pointer to the interception handler for the + * PQAP(AQIC) instruction. + * @mdev: the mediated device + * @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev + * @apm_add: bitmap of APIDs added to the host's AP configuration + * @aqm_add: bitmap of APQIs added to the host's AP configuration + * @adm_add: bitmap of control domain numbers added to the host's AP + * configuration + */ +struct ap_matrix_mdev { + struct vfio_device vdev; + struct list_head node; + struct ap_matrix matrix; + struct ap_matrix shadow_apcb; + struct kvm *kvm; + crypto_hook pqap_hook; + struct mdev_device *mdev; + struct ap_queue_table qtable; + DECLARE_BITMAP(apm_add, AP_DEVICES); + DECLARE_BITMAP(aqm_add, AP_DOMAINS); + DECLARE_BITMAP(adm_add, AP_DOMAINS); +}; + +/** + * struct vfio_ap_queue - contains the data associated with a queue bound to the + * vfio_ap device driver + * @matrix_mdev: the matrix mediated device + * @saved_iova: the notification indicator byte (nib) address + * @apqn: the APQN of the AP queue device + * @saved_isc: the guest ISC registered with the GIB interface + * @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable + * @reset_rc: the status response code from the last reset of the queue + */ +struct vfio_ap_queue { + struct ap_matrix_mdev *matrix_mdev; + dma_addr_t saved_iova; + int apqn; +#define VFIO_AP_ISC_INVALID 0xff + unsigned char saved_isc; + struct hlist_node mdev_qnode; + unsigned int reset_rc; +}; + +int vfio_ap_mdev_register(void); +void vfio_ap_mdev_unregister(void); + +int vfio_ap_mdev_probe_queue(struct ap_device *queue); +void vfio_ap_mdev_remove_queue(struct ap_device *queue); + +int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm); + +void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info, + struct ap_config_info *old_config_info); +void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info, + struct ap_config_info *old_config_info); + +#endif /* _VFIO_AP_PRIVATE_H_ */ |