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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>
* Pierre Morel <pmorel@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"
#include "vfio_ap_debug.h"
#define VFIO_AP_ROOT_NAME "vfio_ap"
#define VFIO_AP_DEV_NAME "matrix"
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
MODULE_LICENSE("GPL v2");
struct ap_matrix_dev *matrix_dev;
debug_info_t *vfio_ap_dbf_info;
/* 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 },
{ .dev_type = AP_DEVICE_TYPE_CEX7,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX8,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ /* end of sibling */ },
};
static struct ap_driver vfio_ap_drv = {
.probe = vfio_ap_mdev_probe_queue,
.remove = vfio_ap_mdev_remove_queue,
.in_use = vfio_ap_mdev_resource_in_use,
.on_config_changed = vfio_ap_on_cfg_changed,
.on_scan_complete = vfio_ap_on_scan_complete,
.ids = ap_queue_ids,
};
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 matrix_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static struct bus_type matrix_bus = {
.name = "matrix",
.match = &matrix_bus_match,
};
static struct device_driver matrix_driver = {
.name = "vfio_ap",
.bus = &matrix_bus,
.suppress_bind_attrs = true,
};
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);
ret = bus_register(&matrix_bus);
if (ret)
goto bus_register_err;
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->mdevs_lock);
INIT_LIST_HEAD(&matrix_dev->mdev_list);
mutex_init(&matrix_dev->guests_lock);
dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
matrix_dev->device.parent = root_device;
matrix_dev->device.bus = &matrix_bus;
matrix_dev->device.release = vfio_ap_matrix_dev_release;
matrix_dev->vfio_ap_drv = &vfio_ap_drv;
ret = device_register(&matrix_dev->device);
if (ret)
goto matrix_reg_err;
ret = driver_register(&matrix_driver);
if (ret)
goto matrix_drv_err;
return 0;
matrix_drv_err:
device_del(&matrix_dev->device);
matrix_reg_err:
put_device(&matrix_dev->device);
matrix_alloc_err:
bus_unregister(&matrix_bus);
bus_register_err:
root_device_unregister(root_device);
return ret;
}
static void vfio_ap_matrix_dev_destroy(void)
{
struct device *root_device = matrix_dev->device.parent;
driver_unregister(&matrix_driver);
device_unregister(&matrix_dev->device);
bus_unregister(&matrix_bus);
root_device_unregister(root_device);
}
static int __init vfio_ap_dbf_info_init(void)
{
vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
DBF_MAX_SPRINTF_ARGS * sizeof(long));
if (!vfio_ap_dbf_info)
return -ENOENT;
debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
debug_set_level(vfio_ap_dbf_info, DBF_WARN);
return 0;
}
static int __init vfio_ap_init(void)
{
int ret;
ret = vfio_ap_dbf_info_init();
if (ret)
return 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;
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();
debug_unregister(vfio_ap_dbf_info);
}
module_init(vfio_ap_init);
module_exit(vfio_ap_exit);
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