158 lines
3.5 KiB
C
158 lines
3.5 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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*/
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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 "vfio_ap_private.h"
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#define VFIO_AP_ROOT_NAME "vfio_ap"
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#define VFIO_AP_DEV_TYPE_NAME "ap_matrix"
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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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static struct ap_driver vfio_ap_drv;
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static struct device_type vfio_ap_dev_type = {
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.name = VFIO_AP_DEV_TYPE_NAME,
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};
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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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{ /* end of sibling */ },
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};
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MODULE_DEVICE_TABLE(vfio_ap, ap_queue_ids);
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static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
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{
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return 0;
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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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/* Nothing to do yet */
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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 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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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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matrix_dev->device.type = &vfio_ap_dev_type;
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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.release = vfio_ap_matrix_dev_release;
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matrix_dev->device.driver = &vfio_ap_drv.driver;
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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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return 0;
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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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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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device_unregister(&matrix_dev->device);
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root_device_unregister(matrix_dev->device.parent);
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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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memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv));
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vfio_ap_drv.probe = vfio_ap_queue_dev_probe;
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vfio_ap_drv.remove = vfio_ap_queue_dev_remove;
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vfio_ap_drv.ids = ap_queue_ids;
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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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