214 строки
4.7 KiB
C
214 строки
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* VFIO based AP device driver
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*
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* Copyright IBM Corp. 2018
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*
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* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
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* Pierre Morel <pmorel@linux.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <asm/facility.h>
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#include "vfio_ap_private.h"
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#define VFIO_AP_ROOT_NAME "vfio_ap"
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#define VFIO_AP_DEV_NAME "matrix"
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
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MODULE_LICENSE("GPL v2");
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struct ap_matrix_dev *matrix_dev;
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/* Only type 10 adapters (CEX4 and later) are supported
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* by the AP matrix device driver
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*/
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static struct ap_device_id ap_queue_ids[] = {
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{ .dev_type = AP_DEVICE_TYPE_CEX4,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ .dev_type = AP_DEVICE_TYPE_CEX5,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ .dev_type = AP_DEVICE_TYPE_CEX6,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ .dev_type = AP_DEVICE_TYPE_CEX7,
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.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
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{ /* end of sibling */ },
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};
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MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
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/**
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* vfio_ap_queue_dev_probe:
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*
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* Allocate a vfio_ap_queue structure and associate it
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* with the device as driver_data.
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*/
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static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
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{
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struct vfio_ap_queue *q;
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q = kzalloc(sizeof(*q), GFP_KERNEL);
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if (!q)
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return -ENOMEM;
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dev_set_drvdata(&apdev->device, q);
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q->apqn = to_ap_queue(&apdev->device)->qid;
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q->saved_isc = VFIO_AP_ISC_INVALID;
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return 0;
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}
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/**
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* vfio_ap_queue_dev_remove:
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*
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* Takes the matrix lock to avoid actions on this device while removing
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* Free the associated vfio_ap_queue structure
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*/
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static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
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{
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struct vfio_ap_queue *q;
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mutex_lock(&matrix_dev->lock);
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q = dev_get_drvdata(&apdev->device);
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vfio_ap_mdev_reset_queue(q, 1);
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dev_set_drvdata(&apdev->device, NULL);
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kfree(q);
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mutex_unlock(&matrix_dev->lock);
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}
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static struct ap_driver vfio_ap_drv = {
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.probe = vfio_ap_queue_dev_probe,
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.remove = vfio_ap_queue_dev_remove,
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.ids = ap_queue_ids,
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};
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static void vfio_ap_matrix_dev_release(struct device *dev)
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{
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struct ap_matrix_dev *matrix_dev = dev_get_drvdata(dev);
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kfree(matrix_dev);
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}
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static int matrix_bus_match(struct device *dev, struct device_driver *drv)
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{
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return 1;
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}
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static struct bus_type matrix_bus = {
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.name = "matrix",
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.match = &matrix_bus_match,
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};
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static struct device_driver matrix_driver = {
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.name = "vfio_ap",
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.bus = &matrix_bus,
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.suppress_bind_attrs = true,
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};
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static int vfio_ap_matrix_dev_create(void)
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{
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int ret;
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struct device *root_device;
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root_device = root_device_register(VFIO_AP_ROOT_NAME);
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if (IS_ERR(root_device))
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return PTR_ERR(root_device);
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ret = bus_register(&matrix_bus);
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if (ret)
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goto bus_register_err;
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matrix_dev = kzalloc(sizeof(*matrix_dev), GFP_KERNEL);
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if (!matrix_dev) {
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ret = -ENOMEM;
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goto matrix_alloc_err;
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}
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/* Fill in config info via PQAP(QCI), if available */
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if (test_facility(12)) {
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ret = ap_qci(&matrix_dev->info);
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if (ret)
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goto matrix_alloc_err;
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}
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mutex_init(&matrix_dev->lock);
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INIT_LIST_HEAD(&matrix_dev->mdev_list);
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dev_set_name(&matrix_dev->device, "%s", VFIO_AP_DEV_NAME);
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matrix_dev->device.parent = root_device;
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matrix_dev->device.bus = &matrix_bus;
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matrix_dev->device.release = vfio_ap_matrix_dev_release;
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matrix_dev->vfio_ap_drv = &vfio_ap_drv;
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ret = device_register(&matrix_dev->device);
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if (ret)
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goto matrix_reg_err;
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ret = driver_register(&matrix_driver);
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if (ret)
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goto matrix_drv_err;
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return 0;
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matrix_drv_err:
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device_unregister(&matrix_dev->device);
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matrix_reg_err:
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put_device(&matrix_dev->device);
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matrix_alloc_err:
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bus_unregister(&matrix_bus);
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bus_register_err:
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root_device_unregister(root_device);
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return ret;
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}
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static void vfio_ap_matrix_dev_destroy(void)
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{
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struct device *root_device = matrix_dev->device.parent;
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driver_unregister(&matrix_driver);
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device_unregister(&matrix_dev->device);
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bus_unregister(&matrix_bus);
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root_device_unregister(root_device);
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}
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static int __init vfio_ap_init(void)
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{
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int ret;
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/* If there are no AP instructions, there is nothing to pass through. */
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if (!ap_instructions_available())
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return -ENODEV;
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ret = vfio_ap_matrix_dev_create();
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if (ret)
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return ret;
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ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME);
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if (ret) {
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vfio_ap_matrix_dev_destroy();
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return ret;
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}
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ret = vfio_ap_mdev_register();
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if (ret) {
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ap_driver_unregister(&vfio_ap_drv);
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vfio_ap_matrix_dev_destroy();
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return ret;
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}
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return 0;
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}
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static void __exit vfio_ap_exit(void)
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{
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vfio_ap_mdev_unregister();
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ap_driver_unregister(&vfio_ap_drv);
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vfio_ap_matrix_dev_destroy();
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}
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module_init(vfio_ap_init);
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module_exit(vfio_ap_exit);
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