vfio_platform.c

   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
  29         return platform_get_mem_or_io(dev, num);
  30 }
  31
  32 static int get_platform_irq(struct vfio_platform_device *vdev, int i)
  33 {
  34         struct platform_device *pdev = (struct platform_device *) vdev->opaque;
  35
  36         return platform_get_irq_optional(pdev, i);
  37 }
  38
  39 static int vfio_platform_probe(struct platform_device *pdev)
  40 {
  41         struct vfio_platform_device *vdev;
  42         int ret;
  43
  44         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
  45         if (!vdev)
  46                 return -ENOMEM;
  47
  48         vdev->opaque = (void *) pdev;
  49         vdev->name = pdev->name;
  50         vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
  51         vdev->get_resource = get_platform_resource;
  52         vdev->get_irq = get_platform_irq;
  53         vdev->reset_required = reset_required;
  54
  55         ret = vfio_platform_probe_common(vdev, &pdev->dev);
  56         if (ret) {
  57                 kfree(vdev);
  58                 return ret;
  59         }
  60         dev_set_drvdata(&pdev->dev, vdev);
  61         return 0;
  62 }
  63
  64 static int vfio_platform_remove(struct platform_device *pdev)
  65 {
  66         struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
  67
  68         vfio_platform_remove_common(vdev);
  69         kfree(vdev);
  70         return 0;
  71 }
  72
  73 static struct platform_driver vfio_platform_driver = {
  74         .probe          = vfio_platform_probe,
  75         .remove         = vfio_platform_remove,
  76         .driver = {
  77                 .name   = "vfio-platform",
  78         },
  79         .driver_managed_dma = true,
  80 };
  81
  82 module_platform_driver(vfio_platform_driver);
  83
  84 MODULE_VERSION(DRIVER_VERSION);
  85 MODULE_LICENSE("GPL v2");
  86 MODULE_AUTHOR(DRIVER_AUTHOR);
  87 MODULE_DESCRIPTION(DRIVER_DESC);