> -----Original Message----- > From: iommu-bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx [mailto:iommu- > bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx] On Behalf Of Antonios Motakis > Sent: Monday, September 30, 2013 8:59 PM > To: kvmarm@xxxxxxxxxxxxxxxxxxxxx; alex.williamson@xxxxxxxxxx > Cc: linux-samsung-soc@xxxxxxxxxxxxxxx; kvm@xxxxxxxxxxxxxxx; agraf@xxxxxxx; Yoder > Stuart-B08248; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx; Antonios Motakis; > tech@xxxxxxxxxxxxxxxxxxxxxx > Subject: [PATCH 2/7] Initial skeleton of VFIO support for Device Tree based > devices > > Platform devices in the Linux kernel are usually managed by the DT interface. > This patch forms the base to support these kind of devices with VFIO. > > Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx> > --- > drivers/vfio/Kconfig | 11 +++ > drivers/vfio/Makefile | 1 + > drivers/vfio/vfio_platform.c | 187 +++++++++++++++++++++++++++++++++++++++++++ > include/uapi/linux/vfio.h | 1 + > 4 files changed, 200 insertions(+) > create mode 100644 drivers/vfio/vfio_platform.c > > diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig index 1f84eda..35254b7 > 100644 > --- a/drivers/vfio/Kconfig > +++ b/drivers/vfio/Kconfig > @@ -13,4 +13,15 @@ menuconfig VFIO > > If you don't know what to do here, say N. > > +config VFIO_PLATFORM > + tristate "VFIO support for device tree based platform devices" > + depends on VFIO && EVENTFD && OF > + help > + Support for platform devices with VFIO. This is required to make > + use of platform devices present on device tree nodes using the VFIO > + framework. Devices that are not described in the device tree cannot > + be used by this driver. > + > + If you don't know what to do here, say N. > + > source "drivers/vfio/pci/Kconfig" > diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile index > 2398d4a..575c8dd 100644 > --- a/drivers/vfio/Makefile > +++ b/drivers/vfio/Makefile > @@ -1,3 +1,4 @@ > obj-$(CONFIG_VFIO) += vfio.o > obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o > obj-$(CONFIG_VFIO_PCI) += pci/ > +obj-$(CONFIG_VFIO_PLATFORM) += vfio_platform.o > diff --git a/drivers/vfio/vfio_platform.c b/drivers/vfio/vfio_platform.c new We can make this parallel to PCI, something like drivers/vfio/platform/platform.c -Bharat > file mode 100644 index 0000000..b9686b0 > --- /dev/null > +++ b/drivers/vfio/vfio_platform.c > @@ -0,0 +1,187 @@ > +/* > + * Copyright (C) 2013 - Virtual Open Systems > + * Author: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx> > + * > + * 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. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. > + */ > + > +#include <linux/device.h> > +#include <linux/eventfd.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> > + > +#define DRIVER_VERSION "0.1" > +#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>" > +#define DRIVER_DESC "VFIO Device Tree devices - User Level meta-driver" > + > +struct vfio_platform_device { > + struct platform_device *pdev; > +}; > + > +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) { > + struct vfio_platform_device *vdev = device_data; > + unsigned long minsz; > + > + if (cmd == VFIO_DEVICE_GET_INFO) { > + struct vfio_device_info info; > + > + minsz = offsetofend(struct vfio_device_info, num_irqs); > + > + if (copy_from_user(&info, (void __user *)arg, minsz)) > + return -EFAULT; > + > + if (info.argsz < minsz) > + return -EINVAL; > + > + info.flags = VFIO_DEVICE_FLAGS_PLATFORM; > + info.num_regions = 0; > + info.num_irqs = 0; > + > + return copy_to_user((void __user *)arg, &info, minsz); > + > + } 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 0; > +} > + > +static ssize_t vfio_platform_write(void *device_data, const char __user *buf, > + size_t count, loff_t *ppos) > +{ > + return 0; > +} > + > +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, > +}; > + > +static int vfio_platform_probe(struct platform_device *pdev) { > + struct vfio_platform_device *vdev; > + struct iommu_group *group; > + int ret; > + > + group = iommu_group_get(&pdev->dev); > + if (!group) { > + pr_err("VFIO: No IOMMU group for device %s\n", pdev->name); > + return -EINVAL; > + } > + > + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); > + if (!vdev) { > + iommu_group_put(group); > + return -ENOMEM; > + } > + > + vdev->pdev = pdev; > + > + ret = vfio_add_group_dev(&pdev->dev, &vfio_platform_ops, vdev); > + if (ret) { > + iommu_group_put(group); > + kfree(vdev); > + } > + > + return ret; > +} > + > +static int vfio_platform_remove(struct platform_device *pdev) { > + struct vfio_platform_device *vdev; > + > + vdev = vfio_del_group_dev(&pdev->dev); > + if (!vdev) > + return -EINVAL; > + > + iommu_group_put(pdev->dev.iommu_group); > + kfree(vdev); > + > + return 0; > +} > + > +static const struct of_device_id vfio_platform_match[] = { > + /* Before this series can be applied, we shall implement a better > + * mechanism to bind the module to any device. For now add the > + * compatible property to the dtb of the devices we want to use. */ > + { > + .compatible = "vfio", > + }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, vfio_platform_match); > + > +static struct platform_driver vfio_platform_driver = { > + .probe = vfio_platform_probe, > + .remove = vfio_platform_remove, > + .driver = { > + .name = "vfio-platform", > + .owner = THIS_MODULE, > + .of_match_table = vfio_platform_match, > + }, > +}; > + > +module_platform_driver(vfio_platform_driver); > + > +MODULE_VERSION(DRIVER_VERSION); > +MODULE_LICENSE("GPL v2"); > +MODULE_AUTHOR(DRIVER_AUTHOR); > +MODULE_DESCRIPTION(DRIVER_DESC); > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index > 284ff24..8d7434d 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -147,6 +147,7 @@ struct vfio_device_info { > __u32 flags; > #define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */ > #define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */ > +#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */ > __u32 num_regions; /* Max region index + 1 */ > __u32 num_irqs; /* Max IRQ index + 1 */ > }; > -- > 1.8.1.2 > > _______________________________________________ > iommu mailing list > iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linuxfoundation.org/mailman/listinfo/iommu -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
