forked from Minki/linux
VFIO fixes for v4.10-rc3
- Add mtty sample driver properly into build system (Alex Williamson) - Restore type1 mapping performance after mdev (Alex Williamson) - Fix mdev device race (Alex Williamson) - Cleanups to the mdev ABI used by vendor drivers (Alex Williamson) - Build fix for old compilers (Arnd Bergmann) - Fix sample driver error path (Dan Carpenter) - Handle pci_iomap() error (Arvind Yadav) - Fix mdev ioctl return type (Paul Gortmaker) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iQIcBAABAgAGBQJYb73JAAoJECObm247sIsi8UoP/22ad8PE1kFxRndZBZ0cAAeR KN/m1fpxRj0cLYC/VG4CseU9qMDKCa6WT/QY/kbR2Mm4CzUdoF1pXyWZkqs1PCuY tOeGk11KR+OM1AhqmJxn1+5A/9Bp0pLUYC+bBujJ5Pg955ePzv8hp6eD1xedjN+H mq4HAWCL8ac0mxNicAo/EUmsdwpUtXN9ruzDnEqMy9u33U4+p9hlWMzKz1xBch1h uIEwSZu2K5Qb7LmN1faCTWHuE2brN3rsIYTE0K4hQn71cksHk2CjURi7YSbaDXRM KUhHO6BS3Wbrr5ljXB8ih08+vesYKfU8nHFNWssQiQtg3SiIy5u7zVXJbDSiOQ3F f7HqZFm8Kpjw15TkpLOWfg03D8LDxBrael8w92Xi1joFQSLw6ei4OFz44lx5f5+1 hfWadBJv7dfATTOaH8jz85ClFzZ+eEI1D5k4ehv9Rt+FL6KQh31AK+LRx98gDKc2 vDVxqfJegMLmAAYcwrmpiv/KytRWveXBGNVmarbXCZ1AhwGSjpV/1PJw2GXY47Fh 0pgjTdVg2X7mB6ljMlB3KioVTzRvXgG0gURiIQC0kEs93bS9aJqywZEjgJJQdcy3 bh+K2vKX0O+V4ekx1fMvHFJM/7l27d8GleWWSnxE6yKW9X3+nkgsZHj9/JayuWF/ nw1fHMl4U7M8dCHmy9mV =EHct -----END PGP SIGNATURE----- Merge tag 'vfio-v4.10-rc3' of git://github.com/awilliam/linux-vfio Pull VFIO fixes from Alex Williamson: - Add mtty sample driver properly into build system (Alex Williamson) - Restore type1 mapping performance after mdev (Alex Williamson) - Fix mdev device race (Alex Williamson) - Cleanups to the mdev ABI used by vendor drivers (Alex Williamson) - Build fix for old compilers (Arnd Bergmann) - Fix sample driver error path (Dan Carpenter) - Handle pci_iomap() error (Arvind Yadav) - Fix mdev ioctl return type (Paul Gortmaker) * tag 'vfio-v4.10-rc3' of git://github.com/awilliam/linux-vfio: vfio-mdev: fix non-standard ioctl return val causing i386 build fail vfio-pci: Handle error from pci_iomap vfio-mdev: fix some error codes in the sample code vfio-pci: use 32-bit comparisons for register address for gcc-4.5 vfio-mdev: Make mdev_device private and abstract interfaces vfio-mdev: Make mdev_parent private vfio-mdev: de-polute the namespace, rename parent_device & parent_ops vfio-mdev: Fix remove race vfio/type1: Restore mapping performance with mdev support vfio-mdev: Fix mtty sample driver building
This commit is contained in:
Linus Torvalds
commit
5824f92463
@ -127,22 +127,22 @@ the VFIO when devices are unbound from the driver.
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Physical Device Driver Interface
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--------------------------------
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The physical device driver interface provides the parent_ops[3] structure to
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define the APIs to manage work in the mediated core driver that is related to
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the physical device.
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The physical device driver interface provides the mdev_parent_ops[3] structure
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to define the APIs to manage work in the mediated core driver that is related
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to the physical device.
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The structures in the parent_ops structure are as follows:
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The structures in the mdev_parent_ops structure are as follows:
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* dev_attr_groups: attributes of the parent device
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* mdev_attr_groups: attributes of the mediated device
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* supported_config: attributes to define supported configurations
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The functions in the parent_ops structure are as follows:
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The functions in the mdev_parent_ops structure are as follows:
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* create: allocate basic resources in a driver for a mediated device
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* remove: free resources in a driver when a mediated device is destroyed
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The callbacks in the parent_ops structure are as follows:
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The callbacks in the mdev_parent_ops structure are as follows:
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* open: open callback of mediated device
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* close: close callback of mediated device
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@ -151,14 +151,14 @@ The callbacks in the parent_ops structure are as follows:
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* write: write emulation callback
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* mmap: mmap emulation callback
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A driver should use the parent_ops structure in the function call to register
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itself with the mdev core driver:
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A driver should use the mdev_parent_ops structure in the function call to
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register itself with the mdev core driver:
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extern int mdev_register_device(struct device *dev,
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const struct parent_ops *ops);
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const struct mdev_parent_ops *ops);
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However, the parent_ops structure is not required in the function call that a
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driver should use to unregister itself with the mdev core driver:
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However, the mdev_parent_ops structure is not required in the function call
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that a driver should use to unregister itself with the mdev core driver:
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extern void mdev_unregister_device(struct device *dev);
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@ -223,6 +223,9 @@ Directories and files under the sysfs for Each Physical Device
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sprintf(buf, "%s-%s", dev_driver_string(parent->dev), group->name);
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(or using mdev_parent_dev(mdev) to arrive at the parent device outside
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of the core mdev code)
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* device_api
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This attribute should show which device API is being created, for example,
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@ -394,5 +397,5 @@ References
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[1] See Documentation/vfio.txt for more information on VFIO.
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[2] struct mdev_driver in include/linux/mdev.h
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[3] struct parent_ops in include/linux/mdev.h
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[3] struct mdev_parent_ops in include/linux/mdev.h
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[4] struct vfio_iommu_driver_ops in include/linux/vfio.h
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@ -169,7 +169,7 @@ static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
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static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
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{
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struct device *dev = &vgpu->vdev.mdev->dev;
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struct device *dev = mdev_dev(vgpu->vdev.mdev);
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struct gvt_dma *this;
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unsigned long g1;
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int rc;
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@ -198,7 +198,7 @@ static void gvt_cache_destroy(struct intel_vgpu *vgpu)
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{
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struct gvt_dma *dma;
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struct rb_node *node = NULL;
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struct device *dev = &vgpu->vdev.mdev->dev;
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struct device *dev = mdev_dev(vgpu->vdev.mdev);
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unsigned long gfn;
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mutex_lock(&vgpu->vdev.cache_lock);
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@ -399,7 +399,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
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struct device *pdev;
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void *gvt;
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pdev = mdev->parent->dev;
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pdev = mdev_parent_dev(mdev);
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gvt = kdev_to_i915(pdev)->gvt;
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type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
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@ -421,7 +421,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
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mdev_set_drvdata(mdev, vgpu);
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gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
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dev_name(&mdev->dev));
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dev_name(mdev_dev(mdev)));
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return 0;
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}
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@ -485,7 +485,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
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vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
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events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
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ret = vfio_register_notifier(&mdev->dev, VFIO_IOMMU_NOTIFY, &events,
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ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
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&vgpu->vdev.iommu_notifier);
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if (ret != 0) {
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gvt_err("vfio_register_notifier for iommu failed: %d\n", ret);
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@ -493,7 +493,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
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}
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events = VFIO_GROUP_NOTIFY_SET_KVM;
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ret = vfio_register_notifier(&mdev->dev, VFIO_GROUP_NOTIFY, &events,
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ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
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&vgpu->vdev.group_notifier);
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if (ret != 0) {
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gvt_err("vfio_register_notifier for group failed: %d\n", ret);
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@ -508,11 +508,11 @@ static int intel_vgpu_open(struct mdev_device *mdev)
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return ret;
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undo_group:
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vfio_unregister_notifier(&mdev->dev, VFIO_GROUP_NOTIFY,
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vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
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&vgpu->vdev.group_notifier);
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undo_iommu:
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vfio_unregister_notifier(&mdev->dev, VFIO_IOMMU_NOTIFY,
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vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
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&vgpu->vdev.iommu_notifier);
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out:
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return ret;
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@ -529,11 +529,11 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
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if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
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return;
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ret = vfio_unregister_notifier(&vgpu->vdev.mdev->dev, VFIO_IOMMU_NOTIFY,
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ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
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&vgpu->vdev.iommu_notifier);
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WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
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ret = vfio_unregister_notifier(&vgpu->vdev.mdev->dev, VFIO_GROUP_NOTIFY,
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ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
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&vgpu->vdev.group_notifier);
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WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
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@ -1111,7 +1111,7 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
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return 0;
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}
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static const struct parent_ops intel_vgpu_ops = {
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static const struct mdev_parent_ops intel_vgpu_ops = {
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.supported_type_groups = intel_vgpu_type_groups,
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.create = intel_vgpu_create,
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.remove = intel_vgpu_remove,
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@ -1398,7 +1398,7 @@ static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
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return pfn;
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pfn = INTEL_GVT_INVALID_ADDR;
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dev = &info->vgpu->vdev.mdev->dev;
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dev = mdev_dev(info->vgpu->vdev.mdev);
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rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
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if (rc != 1) {
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gvt_err("vfio_pin_pages failed for gfn 0x%lx: %d\n", gfn, rc);
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@ -27,6 +27,45 @@ static LIST_HEAD(parent_list);
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static DEFINE_MUTEX(parent_list_lock);
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static struct class_compat *mdev_bus_compat_class;
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static LIST_HEAD(mdev_list);
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static DEFINE_MUTEX(mdev_list_lock);
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struct device *mdev_parent_dev(struct mdev_device *mdev)
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{
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return mdev->parent->dev;
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}
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EXPORT_SYMBOL(mdev_parent_dev);
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void *mdev_get_drvdata(struct mdev_device *mdev)
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{
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return mdev->driver_data;
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}
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EXPORT_SYMBOL(mdev_get_drvdata);
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void mdev_set_drvdata(struct mdev_device *mdev, void *data)
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{
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mdev->driver_data = data;
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}
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EXPORT_SYMBOL(mdev_set_drvdata);
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struct device *mdev_dev(struct mdev_device *mdev)
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{
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return &mdev->dev;
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}
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EXPORT_SYMBOL(mdev_dev);
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struct mdev_device *mdev_from_dev(struct device *dev)
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{
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return dev_is_mdev(dev) ? to_mdev_device(dev) : NULL;
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}
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EXPORT_SYMBOL(mdev_from_dev);
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uuid_le mdev_uuid(struct mdev_device *mdev)
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{
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return mdev->uuid;
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}
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EXPORT_SYMBOL(mdev_uuid);
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static int _find_mdev_device(struct device *dev, void *data)
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{
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struct mdev_device *mdev;
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@ -42,7 +81,7 @@ static int _find_mdev_device(struct device *dev, void *data)
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return 0;
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}
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static bool mdev_device_exist(struct parent_device *parent, uuid_le uuid)
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static bool mdev_device_exist(struct mdev_parent *parent, uuid_le uuid)
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{
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struct device *dev;
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@ -56,9 +95,9 @@ static bool mdev_device_exist(struct parent_device *parent, uuid_le uuid)
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}
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/* Should be called holding parent_list_lock */
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static struct parent_device *__find_parent_device(struct device *dev)
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static struct mdev_parent *__find_parent_device(struct device *dev)
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{
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struct parent_device *parent;
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struct mdev_parent *parent;
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list_for_each_entry(parent, &parent_list, next) {
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if (parent->dev == dev)
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@ -69,8 +108,8 @@ static struct parent_device *__find_parent_device(struct device *dev)
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static void mdev_release_parent(struct kref *kref)
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{
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struct parent_device *parent = container_of(kref, struct parent_device,
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ref);
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struct mdev_parent *parent = container_of(kref, struct mdev_parent,
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ref);
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struct device *dev = parent->dev;
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kfree(parent);
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@ -78,7 +117,7 @@ static void mdev_release_parent(struct kref *kref)
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}
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static
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inline struct parent_device *mdev_get_parent(struct parent_device *parent)
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inline struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
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{
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if (parent)
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kref_get(&parent->ref);
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@ -86,7 +125,7 @@ inline struct parent_device *mdev_get_parent(struct parent_device *parent)
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return parent;
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}
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static inline void mdev_put_parent(struct parent_device *parent)
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static inline void mdev_put_parent(struct mdev_parent *parent)
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{
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if (parent)
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kref_put(&parent->ref, mdev_release_parent);
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@ -95,7 +134,7 @@ static inline void mdev_put_parent(struct parent_device *parent)
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static int mdev_device_create_ops(struct kobject *kobj,
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struct mdev_device *mdev)
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{
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struct parent_device *parent = mdev->parent;
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struct mdev_parent *parent = mdev->parent;
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int ret;
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ret = parent->ops->create(kobj, mdev);
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@ -122,7 +161,7 @@ static int mdev_device_create_ops(struct kobject *kobj,
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*/
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static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
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{
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struct parent_device *parent = mdev->parent;
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struct mdev_parent *parent = mdev->parent;
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int ret;
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/*
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@ -153,10 +192,10 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
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* Add device to list of registered parent devices.
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* Returns a negative value on error, otherwise 0.
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*/
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int mdev_register_device(struct device *dev, const struct parent_ops *ops)
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int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
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{
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int ret;
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struct parent_device *parent;
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struct mdev_parent *parent;
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/* check for mandatory ops */
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if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
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@ -229,7 +268,7 @@ EXPORT_SYMBOL(mdev_register_device);
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void mdev_unregister_device(struct device *dev)
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{
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struct parent_device *parent;
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struct mdev_parent *parent;
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bool force_remove = true;
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mutex_lock(&parent_list_lock);
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@ -266,7 +305,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
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{
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int ret;
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struct mdev_device *mdev;
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struct parent_device *parent;
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struct mdev_parent *parent;
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struct mdev_type *type = to_mdev_type(kobj);
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parent = mdev_get_parent(type->parent);
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@ -316,6 +355,11 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
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dev_dbg(&mdev->dev, "MDEV: created\n");
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mutex_unlock(&parent->lock);
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mutex_lock(&mdev_list_lock);
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list_add(&mdev->next, &mdev_list);
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mutex_unlock(&mdev_list_lock);
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return ret;
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create_failed:
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@ -329,12 +373,30 @@ create_err:
|
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|
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int mdev_device_remove(struct device *dev, bool force_remove)
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{
|
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struct mdev_device *mdev;
|
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struct parent_device *parent;
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struct mdev_device *mdev, *tmp;
|
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struct mdev_parent *parent;
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struct mdev_type *type;
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int ret;
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bool found = false;
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|
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mdev = to_mdev_device(dev);
|
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|
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mutex_lock(&mdev_list_lock);
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list_for_each_entry(tmp, &mdev_list, next) {
|
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if (tmp == mdev) {
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found = true;
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break;
|
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}
|
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}
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|
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if (found)
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list_del(&mdev->next);
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|
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mutex_unlock(&mdev_list_lock);
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|
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if (!found)
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return -ENODEV;
|
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|
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type = to_mdev_type(mdev->type_kobj);
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parent = mdev->parent;
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mutex_lock(&parent->lock);
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@ -342,6 +404,11 @@ int mdev_device_remove(struct device *dev, bool force_remove)
|
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ret = mdev_device_remove_ops(mdev, force_remove);
|
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if (ret) {
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mutex_unlock(&parent->lock);
|
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|
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mutex_lock(&mdev_list_lock);
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list_add(&mdev->next, &mdev_list);
|
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mutex_unlock(&mdev_list_lock);
|
||||
|
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return ret;
|
||||
}
|
||||
|
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@ -349,7 +416,8 @@ int mdev_device_remove(struct device *dev, bool force_remove)
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device_unregister(dev);
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mutex_unlock(&parent->lock);
|
||||
mdev_put_parent(parent);
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init mdev_init(void)
|
||||
|
||||
@ -16,10 +16,33 @@
|
||||
int mdev_bus_register(void);
|
||||
void mdev_bus_unregister(void);
|
||||
|
||||
struct mdev_parent {
|
||||
struct device *dev;
|
||||
const struct mdev_parent_ops *ops;
|
||||
struct kref ref;
|
||||
struct mutex lock;
|
||||
struct list_head next;
|
||||
struct kset *mdev_types_kset;
|
||||
struct list_head type_list;
|
||||
};
|
||||
|
||||
struct mdev_device {
|
||||
struct device dev;
|
||||
struct mdev_parent *parent;
|
||||
uuid_le uuid;
|
||||
void *driver_data;
|
||||
struct kref ref;
|
||||
struct list_head next;
|
||||
struct kobject *type_kobj;
|
||||
};
|
||||
|
||||
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
|
||||
#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
|
||||
|
||||
struct mdev_type {
|
||||
struct kobject kobj;
|
||||
struct kobject *devices_kobj;
|
||||
struct parent_device *parent;
|
||||
struct mdev_parent *parent;
|
||||
struct list_head next;
|
||||
struct attribute_group *group;
|
||||
};
|
||||
@ -29,8 +52,8 @@ struct mdev_type {
|
||||
#define to_mdev_type(_kobj) \
|
||||
container_of(_kobj, struct mdev_type, kobj)
|
||||
|
||||
int parent_create_sysfs_files(struct parent_device *parent);
|
||||
void parent_remove_sysfs_files(struct parent_device *parent);
|
||||
int parent_create_sysfs_files(struct mdev_parent *parent);
|
||||
void parent_remove_sysfs_files(struct mdev_parent *parent);
|
||||
|
||||
int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type);
|
||||
void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type);
|
||||
|
||||
@ -92,7 +92,7 @@ static struct kobj_type mdev_type_ktype = {
|
||||
.release = mdev_type_release,
|
||||
};
|
||||
|
||||
struct mdev_type *add_mdev_supported_type(struct parent_device *parent,
|
||||
struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
|
||||
struct attribute_group *group)
|
||||
{
|
||||
struct mdev_type *type;
|
||||
@ -158,7 +158,7 @@ static void remove_mdev_supported_type(struct mdev_type *type)
|
||||
kobject_put(&type->kobj);
|
||||
}
|
||||
|
||||
static int add_mdev_supported_type_groups(struct parent_device *parent)
|
||||
static int add_mdev_supported_type_groups(struct mdev_parent *parent)
|
||||
{
|
||||
int i;
|
||||
|
||||
@ -183,7 +183,7 @@ static int add_mdev_supported_type_groups(struct parent_device *parent)
|
||||
}
|
||||
|
||||
/* mdev sysfs functions */
|
||||
void parent_remove_sysfs_files(struct parent_device *parent)
|
||||
void parent_remove_sysfs_files(struct mdev_parent *parent)
|
||||
{
|
||||
struct mdev_type *type, *tmp;
|
||||
|
||||
@ -196,7 +196,7 @@ void parent_remove_sysfs_files(struct parent_device *parent)
|
||||
kset_unregister(parent->mdev_types_kset);
|
||||
}
|
||||
|
||||
int parent_create_sysfs_files(struct parent_device *parent)
|
||||
int parent_create_sysfs_files(struct mdev_parent *parent)
|
||||
{
|
||||
int ret;
|
||||
|
||||
|
||||
@ -27,7 +27,7 @@
|
||||
static int vfio_mdev_open(void *device_data)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
int ret;
|
||||
|
||||
if (unlikely(!parent->ops->open))
|
||||
@ -46,7 +46,7 @@ static int vfio_mdev_open(void *device_data)
|
||||
static void vfio_mdev_release(void *device_data)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
|
||||
if (likely(parent->ops->release))
|
||||
parent->ops->release(mdev);
|
||||
@ -58,7 +58,7 @@ static long vfio_mdev_unlocked_ioctl(void *device_data,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
|
||||
if (unlikely(!parent->ops->ioctl))
|
||||
return -EINVAL;
|
||||
@ -70,7 +70,7 @@ static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
|
||||
if (unlikely(!parent->ops->read))
|
||||
return -EINVAL;
|
||||
@ -82,7 +82,7 @@ static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
|
||||
if (unlikely(!parent->ops->write))
|
||||
return -EINVAL;
|
||||
@ -93,7 +93,7 @@ static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
|
||||
static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
|
||||
{
|
||||
struct mdev_device *mdev = device_data;
|
||||
struct parent_device *parent = mdev->parent;
|
||||
struct mdev_parent *parent = mdev->parent;
|
||||
|
||||
if (unlikely(!parent->ops->mmap))
|
||||
return -EINVAL;
|
||||
|
||||
@ -1142,6 +1142,10 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
|
||||
return ret;
|
||||
|
||||
vdev->barmap[index] = pci_iomap(pdev, index, 0);
|
||||
if (!vdev->barmap[index]) {
|
||||
pci_release_selected_regions(pdev, 1 << index);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
|
||||
vma->vm_private_data = vdev;
|
||||
|
||||
@ -193,7 +193,10 @@ ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
|
||||
if (!vdev->has_vga)
|
||||
return -EINVAL;
|
||||
|
||||
switch (pos) {
|
||||
if (pos > 0xbfffful)
|
||||
return -EINVAL;
|
||||
|
||||
switch ((u32)pos) {
|
||||
case 0xa0000 ... 0xbffff:
|
||||
count = min(count, (size_t)(0xc0000 - pos));
|
||||
iomem = ioremap_nocache(0xa0000, 0xbffff - 0xa0000 + 1);
|
||||
|
||||
@ -268,28 +268,38 @@ static void vfio_lock_acct(struct task_struct *task, long npage)
|
||||
{
|
||||
struct vwork *vwork;
|
||||
struct mm_struct *mm;
|
||||
bool is_current;
|
||||
|
||||
if (!npage)
|
||||
return;
|
||||
|
||||
mm = get_task_mm(task);
|
||||
is_current = (task->mm == current->mm);
|
||||
|
||||
mm = is_current ? task->mm : get_task_mm(task);
|
||||
if (!mm)
|
||||
return; /* process exited or nothing to do */
|
||||
return; /* process exited */
|
||||
|
||||
if (down_write_trylock(&mm->mmap_sem)) {
|
||||
mm->locked_vm += npage;
|
||||
up_write(&mm->mmap_sem);
|
||||
mmput(mm);
|
||||
if (!is_current)
|
||||
mmput(mm);
|
||||
return;
|
||||
}
|
||||
|
||||
if (is_current) {
|
||||
mm = get_task_mm(task);
|
||||
if (!mm)
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Couldn't get mmap_sem lock, so must setup to update
|
||||
* mm->locked_vm later. If locked_vm were atomic, we
|
||||
* wouldn't need this silliness
|
||||
*/
|
||||
vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL);
|
||||
if (!vwork) {
|
||||
if (WARN_ON(!vwork)) {
|
||||
mmput(mm);
|
||||
return;
|
||||
}
|
||||
@ -393,77 +403,71 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr,
|
||||
static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
|
||||
long npage, unsigned long *pfn_base)
|
||||
{
|
||||
unsigned long limit;
|
||||
bool lock_cap = ns_capable(task_active_pid_ns(dma->task)->user_ns,
|
||||
CAP_IPC_LOCK);
|
||||
struct mm_struct *mm;
|
||||
long ret, i = 0, lock_acct = 0;
|
||||
unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
|
||||
bool lock_cap = capable(CAP_IPC_LOCK);
|
||||
long ret, pinned = 0, lock_acct = 0;
|
||||
bool rsvd;
|
||||
dma_addr_t iova = vaddr - dma->vaddr + dma->iova;
|
||||
|
||||
mm = get_task_mm(dma->task);
|
||||
if (!mm)
|
||||
/* This code path is only user initiated */
|
||||
if (!current->mm)
|
||||
return -ENODEV;
|
||||
|
||||
ret = vaddr_get_pfn(mm, vaddr, dma->prot, pfn_base);
|
||||
ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, pfn_base);
|
||||
if (ret)
|
||||
goto pin_pg_remote_exit;
|
||||
return ret;
|
||||
|
||||
pinned++;
|
||||
rsvd = is_invalid_reserved_pfn(*pfn_base);
|
||||
limit = task_rlimit(dma->task, RLIMIT_MEMLOCK) >> PAGE_SHIFT;
|
||||
|
||||
/*
|
||||
* Reserved pages aren't counted against the user, externally pinned
|
||||
* pages are already counted against the user.
|
||||
*/
|
||||
if (!rsvd && !vfio_find_vpfn(dma, iova)) {
|
||||
if (!lock_cap && mm->locked_vm + 1 > limit) {
|
||||
if (!lock_cap && current->mm->locked_vm + 1 > limit) {
|
||||
put_pfn(*pfn_base, dma->prot);
|
||||
pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__,
|
||||
limit << PAGE_SHIFT);
|
||||
ret = -ENOMEM;
|
||||
goto pin_pg_remote_exit;
|
||||
return -ENOMEM;
|
||||
}
|
||||
lock_acct++;
|
||||
}
|
||||
|
||||
i++;
|
||||
if (likely(!disable_hugepages)) {
|
||||
/* Lock all the consecutive pages from pfn_base */
|
||||
for (vaddr += PAGE_SIZE, iova += PAGE_SIZE; i < npage;
|
||||
i++, vaddr += PAGE_SIZE, iova += PAGE_SIZE) {
|
||||
unsigned long pfn = 0;
|
||||
if (unlikely(disable_hugepages))
|
||||
goto out;
|
||||
|
||||
ret = vaddr_get_pfn(mm, vaddr, dma->prot, &pfn);
|
||||
if (ret)
|
||||
break;
|
||||
/* Lock all the consecutive pages from pfn_base */
|
||||
for (vaddr += PAGE_SIZE, iova += PAGE_SIZE; pinned < npage;
|
||||
pinned++, vaddr += PAGE_SIZE, iova += PAGE_SIZE) {
|
||||
unsigned long pfn = 0;
|
||||
|
||||
if (pfn != *pfn_base + i ||
|
||||
rsvd != is_invalid_reserved_pfn(pfn)) {
|
||||
ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, &pfn);
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
if (pfn != *pfn_base + pinned ||
|
||||
rsvd != is_invalid_reserved_pfn(pfn)) {
|
||||
put_pfn(pfn, dma->prot);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!rsvd && !vfio_find_vpfn(dma, iova)) {
|
||||
if (!lock_cap &&
|
||||
current->mm->locked_vm + lock_acct + 1 > limit) {
|
||||
put_pfn(pfn, dma->prot);
|
||||
pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
|
||||
__func__, limit << PAGE_SHIFT);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!rsvd && !vfio_find_vpfn(dma, iova)) {
|
||||
if (!lock_cap &&
|
||||
mm->locked_vm + lock_acct + 1 > limit) {
|
||||
put_pfn(pfn, dma->prot);
|
||||
pr_warn("%s: RLIMIT_MEMLOCK (%ld) "
|
||||
"exceeded\n", __func__,
|
||||
limit << PAGE_SHIFT);
|
||||
break;
|
||||
}
|
||||
lock_acct++;
|
||||
}
|
||||
lock_acct++;
|
||||
}
|
||||
}
|
||||
|
||||
vfio_lock_acct(dma->task, lock_acct);
|
||||
ret = i;
|
||||
out:
|
||||
vfio_lock_acct(current, lock_acct);
|
||||
|
||||
pin_pg_remote_exit:
|
||||
mmput(mm);
|
||||
return ret;
|
||||
return pinned;
|
||||
}
|
||||
|
||||
static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova,
|
||||
@ -473,10 +477,10 @@ static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova,
|
||||
long unlocked = 0, locked = 0;
|
||||
long i;
|
||||
|
||||
for (i = 0; i < npage; i++) {
|
||||
for (i = 0; i < npage; i++, iova += PAGE_SIZE) {
|
||||
if (put_pfn(pfn++, dma->prot)) {
|
||||
unlocked++;
|
||||
if (vfio_find_vpfn(dma, iova + (i << PAGE_SHIFT)))
|
||||
if (vfio_find_vpfn(dma, iova))
|
||||
locked++;
|
||||
}
|
||||
}
|
||||
|
||||
@ -13,34 +13,10 @@
|
||||
#ifndef MDEV_H
|
||||
#define MDEV_H
|
||||
|
||||
/* Parent device */
|
||||
struct parent_device {
|
||||
struct device *dev;
|
||||
const struct parent_ops *ops;
|
||||
|
||||
/* internal */
|
||||
struct kref ref;
|
||||
struct mutex lock;
|
||||
struct list_head next;
|
||||
struct kset *mdev_types_kset;
|
||||
struct list_head type_list;
|
||||
};
|
||||
|
||||
/* Mediated device */
|
||||
struct mdev_device {
|
||||
struct device dev;
|
||||
struct parent_device *parent;
|
||||
uuid_le uuid;
|
||||
void *driver_data;
|
||||
|
||||
/* internal */
|
||||
struct kref ref;
|
||||
struct list_head next;
|
||||
struct kobject *type_kobj;
|
||||
};
|
||||
struct mdev_device;
|
||||
|
||||
/**
|
||||
* struct parent_ops - Structure to be registered for each parent device to
|
||||
* struct mdev_parent_ops - Structure to be registered for each parent device to
|
||||
* register the device to mdev module.
|
||||
*
|
||||
* @owner: The module owner.
|
||||
@ -86,10 +62,9 @@ struct mdev_device {
|
||||
* @mdev: mediated device structure
|
||||
* @vma: vma structure
|
||||
* Parent device that support mediated device should be registered with mdev
|
||||
* module with parent_ops structure.
|
||||
* module with mdev_parent_ops structure.
|
||||
**/
|
||||
|
||||
struct parent_ops {
|
||||
struct mdev_parent_ops {
|
||||
struct module *owner;
|
||||
const struct attribute_group **dev_attr_groups;
|
||||
const struct attribute_group **mdev_attr_groups;
|
||||
@ -103,7 +78,7 @@ struct parent_ops {
|
||||
size_t count, loff_t *ppos);
|
||||
ssize_t (*write)(struct mdev_device *mdev, const char __user *buf,
|
||||
size_t count, loff_t *ppos);
|
||||
ssize_t (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
|
||||
long (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
|
||||
unsigned long arg);
|
||||
int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
|
||||
};
|
||||
@ -142,27 +117,22 @@ struct mdev_driver {
|
||||
};
|
||||
|
||||
#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
|
||||
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
|
||||
|
||||
static inline void *mdev_get_drvdata(struct mdev_device *mdev)
|
||||
{
|
||||
return mdev->driver_data;
|
||||
}
|
||||
|
||||
static inline void mdev_set_drvdata(struct mdev_device *mdev, void *data)
|
||||
{
|
||||
mdev->driver_data = data;
|
||||
}
|
||||
extern void *mdev_get_drvdata(struct mdev_device *mdev);
|
||||
extern void mdev_set_drvdata(struct mdev_device *mdev, void *data);
|
||||
extern uuid_le mdev_uuid(struct mdev_device *mdev);
|
||||
|
||||
extern struct bus_type mdev_bus_type;
|
||||
|
||||
#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
|
||||
|
||||
extern int mdev_register_device(struct device *dev,
|
||||
const struct parent_ops *ops);
|
||||
const struct mdev_parent_ops *ops);
|
||||
extern void mdev_unregister_device(struct device *dev);
|
||||
|
||||
extern int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
|
||||
extern void mdev_unregister_driver(struct mdev_driver *drv);
|
||||
|
||||
extern struct device *mdev_parent_dev(struct mdev_device *mdev);
|
||||
extern struct device *mdev_dev(struct mdev_device *mdev);
|
||||
extern struct mdev_device *mdev_from_dev(struct device *dev);
|
||||
|
||||
#endif /* MDEV_H */
|
||||
|
||||
@ -105,4 +105,11 @@ config SAMPLE_BLACKFIN_GPTIMERS
|
||||
help
|
||||
Build samples of blackfin gptimers sample module.
|
||||
|
||||
config SAMPLE_VFIO_MDEV_MTTY
|
||||
tristate "Build VFIO mtty example mediated device sample code -- loadable modules only"
|
||||
depends on VFIO_MDEV_DEVICE && m
|
||||
help
|
||||
Build a virtual tty sample driver for use as a VFIO
|
||||
mediated device
|
||||
|
||||
endif # SAMPLES
|
||||
|
||||
@ -2,4 +2,5 @@
|
||||
|
||||
obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ trace_events/ livepatch/ \
|
||||
hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
|
||||
configfs/ connector/ v4l/ trace_printk/ blackfin/
|
||||
configfs/ connector/ v4l/ trace_printk/ blackfin/ \
|
||||
vfio-mdev/
|
||||
|
||||
@ -1,13 +1 @@
|
||||
#
|
||||
# Makefile for mtty.c file
|
||||
#
|
||||
KERNEL_DIR:=/lib/modules/$(shell uname -r)/build
|
||||
|
||||
obj-m:=mtty.o
|
||||
|
||||
modules clean modules_install:
|
||||
$(MAKE) -C $(KERNEL_DIR) SUBDIRS=$(PWD) $@
|
||||
|
||||
default: modules
|
||||
|
||||
module: modules
|
||||
obj-$(CONFIG_SAMPLE_VFIO_MDEV_MTTY) += mtty.o
|
||||
|
||||
@ -164,7 +164,7 @@ static struct mdev_state *find_mdev_state_by_uuid(uuid_le uuid)
|
||||
struct mdev_state *mds;
|
||||
|
||||
list_for_each_entry(mds, &mdev_devices_list, next) {
|
||||
if (uuid_le_cmp(mds->mdev->uuid, uuid) == 0)
|
||||
if (uuid_le_cmp(mdev_uuid(mds->mdev), uuid) == 0)
|
||||
return mds;
|
||||
}
|
||||
|
||||
@ -341,7 +341,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
|
||||
pr_err("Serial port %d: Fifo level trigger\n",
|
||||
index);
|
||||
#endif
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(
|
||||
mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
} else {
|
||||
#if defined(DEBUG_INTR)
|
||||
@ -355,7 +356,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
|
||||
*/
|
||||
if (mdev_state->s[index].uart_reg[UART_IER] &
|
||||
UART_IER_RLSI)
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(
|
||||
mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
mutex_unlock(&mdev_state->rxtx_lock);
|
||||
break;
|
||||
@ -374,7 +376,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
|
||||
pr_err("Serial port %d: IER_THRI write\n",
|
||||
index);
|
||||
#endif
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(
|
||||
mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
|
||||
mutex_unlock(&mdev_state->rxtx_lock);
|
||||
@ -445,7 +448,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
|
||||
#if defined(DEBUG_INTR)
|
||||
pr_err("Serial port %d: MCR_OUT2 write\n", index);
|
||||
#endif
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
|
||||
if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) &&
|
||||
@ -453,7 +456,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
|
||||
#if defined(DEBUG_INTR)
|
||||
pr_err("Serial port %d: MCR RTS/DTR write\n", index);
|
||||
#endif
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
break;
|
||||
|
||||
@ -504,7 +507,8 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,
|
||||
#endif
|
||||
if (mdev_state->s[index].uart_reg[UART_IER] &
|
||||
UART_IER_THRI)
|
||||
mtty_trigger_interrupt(mdev_state->mdev->uuid);
|
||||
mtty_trigger_interrupt(
|
||||
mdev_uuid(mdev_state->mdev));
|
||||
}
|
||||
mutex_unlock(&mdev_state->rxtx_lock);
|
||||
|
||||
@ -734,7 +738,7 @@ int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
|
||||
|
||||
for (i = 0; i < 2; i++) {
|
||||
snprintf(name, MTTY_STRING_LEN, "%s-%d",
|
||||
dev_driver_string(mdev->parent->dev), i + 1);
|
||||
dev_driver_string(mdev_parent_dev(mdev)), i + 1);
|
||||
if (!strcmp(kobj->name, name)) {
|
||||
nr_ports = i + 1;
|
||||
break;
|
||||
@ -1298,10 +1302,8 @@ static ssize_t
|
||||
sample_mdev_dev_show(struct device *dev, struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct mdev_device *mdev = to_mdev_device(dev);
|
||||
|
||||
if (mdev)
|
||||
return sprintf(buf, "This is MDEV %s\n", dev_name(&mdev->dev));
|
||||
if (mdev_from_dev(dev))
|
||||
return sprintf(buf, "This is MDEV %s\n", dev_name(dev));
|
||||
|
||||
return sprintf(buf, "\n");
|
||||
}
|
||||
@ -1402,7 +1404,7 @@ struct attribute_group *mdev_type_groups[] = {
|
||||
NULL,
|
||||
};
|
||||
|
||||
struct parent_ops mdev_fops = {
|
||||
struct mdev_parent_ops mdev_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.dev_attr_groups = mtty_dev_groups,
|
||||
.mdev_attr_groups = mdev_dev_groups,
|
||||
@ -1447,6 +1449,7 @@ static int __init mtty_dev_init(void)
|
||||
|
||||
if (IS_ERR(mtty_dev.vd_class)) {
|
||||
pr_err("Error: failed to register mtty_dev class\n");
|
||||
ret = PTR_ERR(mtty_dev.vd_class);
|
||||
goto failed1;
|
||||
}
|
||||
|
||||
@ -1458,7 +1461,8 @@ static int __init mtty_dev_init(void)
|
||||
if (ret)
|
||||
goto failed2;
|
||||
|
||||
if (mdev_register_device(&mtty_dev.dev, &mdev_fops) != 0)
|
||||
ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
|
||||
if (ret)
|
||||
goto failed3;
|
||||
|
||||
mutex_init(&mdev_list_lock);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user