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/pm_runtime.h> 11 #include <linux/platform_device.h> 12 13 #include "vfio_platform_private.h" 14 15 #define DRIVER_VERSION "0.10" 16 #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" 17 #define DRIVER_DESC "VFIO for platform devices - User Level meta-driver" 18 19 static bool reset_required = true; 20 module_param(reset_required, bool, 0444); 21 MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)"); 22 23 /* probing devices from the linux platform bus */ 24 25 static struct resource *get_platform_resource(struct vfio_platform_device *vdev, 26 int num) 27 { 28 struct platform_device *dev = (struct platform_device *) vdev->opaque; 29 30 return platform_get_mem_or_io(dev, num); 31 } 32 33 static int get_platform_irq(struct vfio_platform_device *vdev, int i) 34 { 35 struct platform_device *pdev = (struct platform_device *) vdev->opaque; 36 37 return platform_get_irq_optional(pdev, i); 38 } 39 40 static int vfio_platform_init_dev(struct vfio_device *core_vdev) 41 { 42 struct vfio_platform_device *vdev = 43 container_of(core_vdev, struct vfio_platform_device, vdev); 44 struct platform_device *pdev = to_platform_device(core_vdev->dev); 45 46 vdev->opaque = (void *) pdev; 47 vdev->name = pdev->name; 48 vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM; 49 vdev->get_resource = get_platform_resource; 50 vdev->get_irq = get_platform_irq; 51 vdev->reset_required = reset_required; 52 53 return vfio_platform_init_common(vdev); 54 } 55 56 static const struct vfio_device_ops vfio_platform_ops; 57 static int vfio_platform_probe(struct platform_device *pdev) 58 { 59 struct vfio_platform_device *vdev; 60 int ret; 61 62 vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev, 63 &vfio_platform_ops); 64 if (IS_ERR(vdev)) 65 return PTR_ERR(vdev); 66 67 ret = vfio_register_group_dev(&vdev->vdev); 68 if (ret) 69 goto out_put_vdev; 70 71 pm_runtime_enable(&pdev->dev); 72 dev_set_drvdata(&pdev->dev, vdev); 73 return 0; 74 75 out_put_vdev: 76 vfio_put_device(&vdev->vdev); 77 return ret; 78 } 79 80 static void vfio_platform_release_dev(struct vfio_device *core_vdev) 81 { 82 struct vfio_platform_device *vdev = 83 container_of(core_vdev, struct vfio_platform_device, vdev); 84 85 vfio_platform_release_common(vdev); 86 vfio_free_device(core_vdev); 87 } 88 89 static int vfio_platform_remove(struct platform_device *pdev) 90 { 91 struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev); 92 93 vfio_unregister_group_dev(&vdev->vdev); 94 pm_runtime_disable(vdev->device); 95 vfio_put_device(&vdev->vdev); 96 return 0; 97 } 98 99 static const struct vfio_device_ops vfio_platform_ops = { 100 .name = "vfio-platform", 101 .init = vfio_platform_init_dev, 102 .release = vfio_platform_release_dev, 103 .open_device = vfio_platform_open_device, 104 .close_device = vfio_platform_close_device, 105 .ioctl = vfio_platform_ioctl, 106 .read = vfio_platform_read, 107 .write = vfio_platform_write, 108 .mmap = vfio_platform_mmap, 109 }; 110 111 static struct platform_driver vfio_platform_driver = { 112 .probe = vfio_platform_probe, 113 .remove = vfio_platform_remove, 114 .driver = { 115 .name = "vfio-platform", 116 }, 117 .driver_managed_dma = true, 118 }; 119 120 module_platform_driver(vfio_platform_driver); 121 122 MODULE_VERSION(DRIVER_VERSION); 123 MODULE_LICENSE("GPL v2"); 124 MODULE_AUTHOR(DRIVER_AUTHOR); 125 MODULE_DESCRIPTION(DRIVER_DESC); 126