32a2d71c4e
To prepare for vfio platform reset rework let's build vfio_platform_common.c and vfio_platform_irq.c in a separate module from vfio-platform and vfio-amba. This makes possible to have separate module inits and works around a race between platform driver init and vfio reset module init: that way we make sure symbols exported by base are available when vfio-platform driver gets probed. The open/release being implemented in the base module, the ref count is applied to the parent module instead. Signed-off-by: Eric Auger <eric.auger@linaro.org> Suggested-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
116 lines
2.6 KiB
C
116 lines
2.6 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/amba/bus.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 AMBA devices - User Level meta-driver"
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/* probing devices from the AMBA bus */
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static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
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int i)
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{
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struct amba_device *adev = (struct amba_device *) vdev->opaque;
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if (i == 0)
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return &adev->res;
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return NULL;
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}
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static int get_amba_irq(struct vfio_platform_device *vdev, int i)
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{
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struct amba_device *adev = (struct amba_device *) vdev->opaque;
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int ret = 0;
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if (i < AMBA_NR_IRQS)
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ret = adev->irq[i];
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/* zero is an unset IRQ for AMBA devices */
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return ret ? ret : -ENXIO;
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}
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static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
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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->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
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if (!vdev->name) {
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kfree(vdev);
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return -ENOMEM;
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}
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vdev->opaque = (void *) adev;
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vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
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vdev->get_resource = get_amba_resource;
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vdev->get_irq = get_amba_irq;
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vdev->parent_module = THIS_MODULE;
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ret = vfio_platform_probe_common(vdev, &adev->dev);
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if (ret) {
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kfree(vdev->name);
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kfree(vdev);
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}
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return ret;
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}
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static int vfio_amba_remove(struct amba_device *adev)
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{
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struct vfio_platform_device *vdev;
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vdev = vfio_platform_remove_common(&adev->dev);
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if (vdev) {
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kfree(vdev->name);
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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 amba_id pl330_ids[] = {
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{ 0, 0 },
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};
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MODULE_DEVICE_TABLE(amba, pl330_ids);
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static struct amba_driver vfio_amba_driver = {
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.probe = vfio_amba_probe,
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.remove = vfio_amba_remove,
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.id_table = pl330_ids,
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.drv = {
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.name = "vfio-amba",
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.owner = THIS_MODULE,
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},
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};
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module_amba_driver(vfio_amba_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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