1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2013 - Virtual Open Systems
4  * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
5  */
6 
7 #include <linux/module.h>
8 #include <linux/slab.h>
9 #include <linux/vfio.h>
10 #include <linux/platform_device.h>
11 
12 #include "vfio_platform_private.h"
13 
14 #define DRIVER_VERSION  "0.10"
15 #define DRIVER_AUTHOR   "Antonios Motakis <a.motakis@virtualopensystems.com>"
16 #define DRIVER_DESC     "VFIO for platform devices - User Level meta-driver"
17 
18 static bool reset_required = true;
19 module_param(reset_required, bool, 0444);
20 MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
21 
22 /* probing devices from the linux platform bus */
23 
24 static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
25 					      int num)
26 {
27 	struct platform_device *dev = (struct platform_device *) vdev->opaque;
28 	int i;
29 
30 	for (i = 0; i < dev->num_resources; i++) {
31 		struct resource *r = &dev->resource[i];
32 
33 		if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
34 			if (!num)
35 				return r;
36 
37 			num--;
38 		}
39 	}
40 	return NULL;
41 }
42 
43 static int get_platform_irq(struct vfio_platform_device *vdev, int i)
44 {
45 	struct platform_device *pdev = (struct platform_device *) vdev->opaque;
46 
47 	return platform_get_irq(pdev, i);
48 }
49 
50 static int vfio_platform_probe(struct platform_device *pdev)
51 {
52 	struct vfio_platform_device *vdev;
53 	int ret;
54 
55 	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
56 	if (!vdev)
57 		return -ENOMEM;
58 
59 	vdev->opaque = (void *) pdev;
60 	vdev->name = pdev->name;
61 	vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
62 	vdev->get_resource = get_platform_resource;
63 	vdev->get_irq = get_platform_irq;
64 	vdev->parent_module = THIS_MODULE;
65 	vdev->reset_required = reset_required;
66 
67 	ret = vfio_platform_probe_common(vdev, &pdev->dev);
68 	if (ret)
69 		kfree(vdev);
70 
71 	return ret;
72 }
73 
74 static int vfio_platform_remove(struct platform_device *pdev)
75 {
76 	struct vfio_platform_device *vdev;
77 
78 	vdev = vfio_platform_remove_common(&pdev->dev);
79 	if (vdev) {
80 		kfree(vdev);
81 		return 0;
82 	}
83 
84 	return -EINVAL;
85 }
86 
87 static struct platform_driver vfio_platform_driver = {
88 	.probe		= vfio_platform_probe,
89 	.remove		= vfio_platform_remove,
90 	.driver	= {
91 		.name	= "vfio-platform",
92 	},
93 };
94 
95 module_platform_driver(vfio_platform_driver);
96 
97 MODULE_VERSION(DRIVER_VERSION);
98 MODULE_LICENSE("GPL v2");
99 MODULE_AUTHOR(DRIVER_AUTHOR);
100 MODULE_DESCRIPTION(DRIVER_DESC);
101