b5add544d6
The code was allowing platform devices to be used without a supporting VFIO reset driver. The hardware can be left in some inconsistent state after a guest machine abort. The reset driver will put the hardware back to safe state and disable interrupts before returning the control back to the host machine. Adding a new reset_required kernel module option to platform VFIO drivers. The default value is true for the DT and ACPI based drivers. The reset requirement value for AMBA drivers is set to false and is unchangeable to maintain the existing functionality. New requirements are: 1. A reset function needs to be implemented by the corresponding driver via DT/ACPI. 2. The reset function needs to be discovered via DT/ACPI. The probe of the driver will fail if any of the above conditions are not satisfied. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/*
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* Copyright (C) 2013 - Virtual Open Systems
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* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vfio.h>
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#include <linux/platform_device.h>
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#include "vfio_platform_private.h"
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#define DRIVER_VERSION "0.10"
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#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
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#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
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static bool reset_required = true;
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module_param(reset_required, bool, 0444);
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MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
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/* probing devices from the linux platform bus */
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static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
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int num)
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{
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struct platform_device *dev = (struct platform_device *) vdev->opaque;
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int i;
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for (i = 0; i < dev->num_resources; i++) {
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struct resource *r = &dev->resource[i];
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if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
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if (!num)
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return r;
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num--;
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}
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}
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return NULL;
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}
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static int get_platform_irq(struct vfio_platform_device *vdev, int i)
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{
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struct platform_device *pdev = (struct platform_device *) vdev->opaque;
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return platform_get_irq(pdev, i);
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}
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static int vfio_platform_probe(struct platform_device *pdev)
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{
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struct vfio_platform_device *vdev;
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int ret;
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vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
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if (!vdev)
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return -ENOMEM;
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vdev->opaque = (void *) pdev;
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vdev->name = pdev->name;
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vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
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vdev->get_resource = get_platform_resource;
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vdev->get_irq = get_platform_irq;
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vdev->parent_module = THIS_MODULE;
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vdev->reset_required = reset_required;
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ret = vfio_platform_probe_common(vdev, &pdev->dev);
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if (ret)
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kfree(vdev);
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return ret;
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}
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static int vfio_platform_remove(struct platform_device *pdev)
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{
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struct vfio_platform_device *vdev;
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vdev = vfio_platform_remove_common(&pdev->dev);
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if (vdev) {
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kfree(vdev);
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return 0;
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}
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return -EINVAL;
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}
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static struct platform_driver vfio_platform_driver = {
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.probe = vfio_platform_probe,
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.remove = vfio_platform_remove,
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.driver = {
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.name = "vfio-platform",
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},
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};
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module_platform_driver(vfio_platform_driver);
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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