From: Antonios Motakis <a.mota...@virtualopensystems.com> 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> [Baptiste Reynal: added includes in vfio_platform_private.h] Signed-off-by: Baptiste Reynal <b.rey...@virtualopensystems.com> --- drivers/vfio/platform/vfio_platform_common.c | 121 ++++++++++++++++++++++++++ drivers/vfio/platform/vfio_platform_private.h | 39 +++++++++ 2 files changed, 160 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..34d023b --- /dev/null +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -0,0 +1,121 @@ +/* + * 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/iommu.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/vfio.h> + +#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) +{ + 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; + } + + 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..c046988 --- /dev/null +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -0,0 +1,39 @@ +/* + * 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 + +#include <linux/types.h> +#include <linux/interrupt.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 */ -- 2.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/