Hi Antonios,
On 10/27/2014 07:07 PM, Antonios Motakis wrote:
> This patch forms the common skeleton code for platform devices support
> with VFIO. This will include the core functionality of VFIO_PLATFORM,
> however binding to the device and discovering the device resources will
> be done with the help of a separate file where any Linux platform bus
> specific code will reside.
>
> This will allow us to implement support for also discovering AMBA devices
> and their resources, but still reuse a large part of the VFIO_PLATFORM
> implementation.
>
> Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com>
> ---
> drivers/vfio/platform/vfio_platform_common.c | 126
> ++++++++++++++++++++++++++
> drivers/vfio/platform/vfio_platform_private.h | 36 ++++++++
> 2 files changed, 162 insertions(+)
> create mode 100644 drivers/vfio/platform/vfio_platform_common.c
> create mode 100644 drivers/vfio/platform/vfio_platform_private.h
>
> diff --git a/drivers/vfio/platform/vfio_platform_common.c
> b/drivers/vfio/platform/vfio_platform_common.c
> new file mode 100644
> index 0000000..e0fdbc8
> --- /dev/null
> +++ b/drivers/vfio/platform/vfio_platform_common.c
> @@ -0,0 +1,126 @@
> +/*
> + * Copyright (C) 2013 - Virtual Open Systems
> + * Author: Antonios Motakis <a.mota...@virtualopensystems.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License, version 2, as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/iommu.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/notifier.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/slab.h>
> +#include <linux/types.h>
> +#include <linux/uaccess.h>
> +#include <linux/vfio.h>
> +#include <linux/io.h>
not sure at that state all the above includes are needed.
> +
> +#include "vfio_platform_private.h"
> +
> +static void vfio_platform_release(void *device_data)
> +{
> + module_put(THIS_MODULE);
> +}
> +
> +static int vfio_platform_open(void *device_data)
> +{
> + if (!try_module_get(THIS_MODULE))
> + return -ENODEV;
> +
> + return 0;
> +}
> +
> +static long vfio_platform_ioctl(void *device_data,
> + unsigned int cmd, unsigned long arg)
a minor style comment/question that applies on all the series. Shouldn't
subsequent argument lines rather be aligned with the first char after
"(", as done in PCI code?
> +{
> + if (cmd == VFIO_DEVICE_GET_INFO)
> + return -EINVAL;
> +
> + else if (cmd == VFIO_DEVICE_GET_REGION_INFO)
> + return -EINVAL;
> +
> + else if (cmd == VFIO_DEVICE_GET_IRQ_INFO)
> + return -EINVAL;
> +
> + else if (cmd == VFIO_DEVICE_SET_IRQS)
> + return -EINVAL;
> +
> + else if (cmd == VFIO_DEVICE_RESET)
> + return -EINVAL;
> +
> + return -ENOTTY;
> +}
> +
> +static ssize_t vfio_platform_read(void *device_data, char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + return -EINVAL;
> +}
> +
> +static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
> + size_t count, loff_t *ppos)
> +{
> + return -EINVAL;
> +}
> +
> +static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
> +{
> + return -EINVAL;
> +}
> +
> +static const struct vfio_device_ops vfio_platform_ops = {
> + .name = "vfio-platform",
> + .open = vfio_platform_open,
> + .release = vfio_platform_release,
> + .ioctl = vfio_platform_ioctl,
> + .read = vfio_platform_read,
> + .write = vfio_platform_write,
> + .mmap = vfio_platform_mmap,
> +};
> +
> +int vfio_platform_probe_common(struct vfio_platform_device *vdev,
> + struct device *dev)
> +{
> + struct iommu_group *group;
> + int ret;
> +
> + if (!vdev)
> + return -EINVAL;
> +
> + group = iommu_group_get(dev);
> + if (!group) {
> + pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
> + return -EINVAL;
> + }
I saw the above check also is done at beginning of vfio_add_group_dev.
Added value however is pr_err which is useful and PCI code does the
check too.
Eric
> +
> + ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
> + if (ret) {
> + iommu_group_put(group);
> + return ret;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
> +
> +struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
> +{
> + struct vfio_platform_device *vdev;
> +
> + vdev = vfio_del_group_dev(dev);
> + if (vdev)
> + iommu_group_put(dev->iommu_group);
> +
> + return vdev;
> +}
> +EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
> diff --git a/drivers/vfio/platform/vfio_platform_private.h
> b/drivers/vfio/platform/vfio_platform_private.h
> new file mode 100644
> index 0000000..062b92d
> --- /dev/null
> +++ b/drivers/vfio/platform/vfio_platform_private.h
> @@ -0,0 +1,36 @@
> +/*
> + * Copyright (C) 2013 - Virtual Open Systems
> + * Author: Antonios Motakis <a.mota...@virtualopensystems.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License, version 2, as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef VFIO_PLATFORM_PRIVATE_H
> +#define VFIO_PLATFORM_PRIVATE_H
> +
> +struct vfio_platform_device {
> + /*
> + * These fields should be filled by the bus specific binder
> + */
> + void *opaque;
> + const char *name;
> + uint32_t flags;
> + /* callbacks to discover device resources */
> + struct resource*
> + (*get_resource)(struct vfio_platform_device *vdev, int i);
> + int (*get_irq)(struct vfio_platform_device *vdev, int i);
> +};
> +
> +extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
> + struct device *dev);
> +extern struct vfio_platform_device *vfio_platform_remove_common
> + (struct device *dev);
> +
> +#endif /* VFIO_PLATFORM_PRIVATE_H */
>
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