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// SPDX-License-Identifier: GPL-2.0+
/*
* VFIO based AP device driver
*
* Copyright IBM Corp. 2018
*
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
*/
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/facility.h>
#include "vfio_ap_private.h"
#define VFIO_AP_ROOT_NAME "vfio_ap"
#define VFIO_AP_DEV_TYPE_NAME "ap_matrix"
#define VFIO_AP_DEV_NAME "matrix"
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
MODULE_LICENSE("GPL v2");
static struct ap_driver vfio_ap_drv;
static struct device_type vfio_ap_dev_type = {
.name = VFIO_AP_DEV_TYPE_NAME,
};
struct ap_matrix_dev *matrix_dev;
/* Only type 10 adapters (CEX4 and later) are supported
* by the AP matrix device driver
*/
static struct ap_device_id ap_queue_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_CEX4,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX5,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX6,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ /* end of sibling */ },
};
MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
{
return 0;
}
static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
{
/* Nothing to do yet */
}
static void vfio_ap_matrix_dev_release(struct device *dev)
{
struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
kfree(matrix_dev);
}
static int vfio_ap_matrix_dev_create(void)
{
int ret;
struct device *root_device;
root_device = root_device_register(VFIO_AP_ROOT_NAME);
if (IS_ERR(root_device))
return PTR_ERR(root_device);
matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
if (!matrix_dev) {
ret = -ENOMEM;
goto matrix_alloc_err;
}
/* Fill in config info via PQAP(QCI), if available */
if (test_facility(12)) {
ret = ap_qci(&matrix_dev->info);
if (ret)
goto matrix_alloc_err;
}
mutex_init(&matrix_dev->lock);
INIT_LIST_HEAD(&matrix_dev->mdev_list);
matrix_dev->device.type = &vfio_ap_dev_type;
dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
matrix_dev->device.parent = root_device;
matrix_dev->device.release = vfio_ap_matrix_dev_release;
matrix_dev->device.driver = &vfio_ap_drv.driver;
ret = device_register(&matrix_dev->device);
if (ret)
goto matrix_reg_err;
return 0;
matrix_reg_err:
put_device(&matrix_dev->device);
matrix_alloc_err:
root_device_unregister(root_device);
return ret;
}
static void vfio_ap_matrix_dev_destroy(void)
{
device_unregister(&matrix_dev->device);
root_device_unregister(matrix_dev->device.parent);
}
static int __init vfio_ap_init(void)
{
int ret;
/* If there are no AP instructions, there is nothing to pass through. */
if (!ap_instructions_available())
return -ENODEV;
ret = vfio_ap_matrix_dev_create();
if (ret)
return ret;
memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv));
vfio_ap_drv.probe = vfio_ap_queue_dev_probe;
vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
vfio_ap_drv.ids = ap_queue_ids;
ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
if (ret) {
vfio_ap_matrix_dev_destroy();
return ret;
}
ret = vfio_ap_mdev_register();
if (ret) {
ap_driver_unregister(&vfio_ap_drv);
vfio_ap_matrix_dev_destroy();
return ret;
}
return 0;
}
static void __exit vfio_ap_exit(void)
{
vfio_ap_mdev_unregister();
ap_driver_unregister(&vfio_ap_drv);
vfio_ap_matrix_dev_destroy();
}
module_init(vfio_ap_init);
module_exit(vfio_ap_exit);
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