diff options
author | Jason Gunthorpe <jgg@nvidia.com> | 2022-07-20 03:02:48 +0300 |
---|---|---|
committer | Alex Williamson <alex.williamson@redhat.com> | 2022-07-20 20:57:59 +0300 |
commit | ce4b4657ff18925c315855aa290e93c5fa652d96 (patch) | |
tree | 0d477801e16d534577d08b2a76cb969896e521f1 /drivers | |
parent | 2a8ed7ef00b939fbcc98b948f780bd03bafed227 (diff) | |
download | linux-ce4b4657ff18925c315855aa290e93c5fa652d96.tar.xz |
vfio: Replace the DMA unmapping notifier with a callback
Instead of having drivers register the notifier with explicit code just
have them provide a dma_unmap callback op in their driver ops and rely on
the core code to wire it up.
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/1-v4-681e038e30fd+78-vfio_unmap_notif_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/gpu/drm/i915/gvt/gvt.h | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/kvmgt.c | 75 | ||||
-rw-r--r-- | drivers/s390/cio/vfio_ccw_ops.c | 39 | ||||
-rw-r--r-- | drivers/s390/cio/vfio_ccw_private.h | 2 | ||||
-rw-r--r-- | drivers/s390/crypto/vfio_ap_ops.c | 53 | ||||
-rw-r--r-- | drivers/s390/crypto/vfio_ap_private.h | 3 | ||||
-rw-r--r-- | drivers/vfio/vfio.c | 129 | ||||
-rw-r--r-- | drivers/vfio/vfio.h | 3 |
8 files changed, 82 insertions, 223 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index aee1a45da74b..705689e64011 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -226,7 +226,6 @@ struct intel_vgpu { unsigned long nr_cache_entries; struct mutex cache_lock; - struct notifier_block iommu_notifier; atomic_t released; struct kvm_page_track_notifier_node track_node; diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c index e2f6c56ab342..ecd5bb37b63a 100644 --- a/drivers/gpu/drm/i915/gvt/kvmgt.c +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c @@ -729,34 +729,25 @@ int intel_gvt_set_edid(struct intel_vgpu *vgpu, int port_num) return ret; } -static int intel_vgpu_iommu_notifier(struct notifier_block *nb, - unsigned long action, void *data) +static void intel_vgpu_dma_unmap(struct vfio_device *vfio_dev, u64 iova, + u64 length) { - struct intel_vgpu *vgpu = - container_of(nb, struct intel_vgpu, iommu_notifier); - - if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { - struct vfio_iommu_type1_dma_unmap *unmap = data; - struct gvt_dma *entry; - unsigned long iov_pfn, end_iov_pfn; + struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev); + struct gvt_dma *entry; + u64 iov_pfn = iova >> PAGE_SHIFT; + u64 end_iov_pfn = iov_pfn + length / PAGE_SIZE; - iov_pfn = unmap->iova >> PAGE_SHIFT; - end_iov_pfn = iov_pfn + unmap->size / PAGE_SIZE; + mutex_lock(&vgpu->cache_lock); + for (; iov_pfn < end_iov_pfn; iov_pfn++) { + entry = __gvt_cache_find_gfn(vgpu, iov_pfn); + if (!entry) + continue; - mutex_lock(&vgpu->cache_lock); - for (; iov_pfn < end_iov_pfn; iov_pfn++) { - entry = __gvt_cache_find_gfn(vgpu, iov_pfn); - if (!entry) - continue; - - gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr, - entry->size); - __gvt_cache_remove_entry(vgpu, entry); - } - mutex_unlock(&vgpu->cache_lock); + gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr, + entry->size); + __gvt_cache_remove_entry(vgpu, entry); } - - return NOTIFY_OK; + mutex_unlock(&vgpu->cache_lock); } static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu) @@ -783,36 +774,20 @@ out: static int intel_vgpu_open_device(struct vfio_device *vfio_dev) { struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev); - unsigned long events; - int ret; - - vgpu->iommu_notifier.notifier_call = intel_vgpu_iommu_notifier; - events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; - ret = vfio_register_notifier(vfio_dev, VFIO_IOMMU_NOTIFY, &events, - &vgpu->iommu_notifier); - if (ret != 0) { - gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n", - ret); - goto out; - } - - ret = -EEXIST; if (vgpu->attached) - goto undo_iommu; + return -EEXIST; - ret = -ESRCH; if (!vgpu->vfio_device.kvm || vgpu->vfio_device.kvm->mm != current->mm) { gvt_vgpu_err("KVM is required to use Intel vGPU\n"); - goto undo_iommu; + return -ESRCH; } kvm_get_kvm(vgpu->vfio_device.kvm); - ret = -EEXIST; if (__kvmgt_vgpu_exist(vgpu)) - goto undo_iommu; + return -EEXIST; vgpu->attached = true; @@ -831,12 +806,6 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev) atomic_set(&vgpu->released, 0); return 0; - -undo_iommu: - vfio_unregister_notifier(vfio_dev, VFIO_IOMMU_NOTIFY, - &vgpu->iommu_notifier); -out: - return ret; } static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu) @@ -853,8 +822,6 @@ static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu) static void intel_vgpu_close_device(struct vfio_device *vfio_dev) { struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev); - struct drm_i915_private *i915 = vgpu->gvt->gt->i915; - int ret; if (!vgpu->attached) return; @@ -864,11 +831,6 @@ static void intel_vgpu_close_device(struct vfio_device *vfio_dev) intel_gvt_release_vgpu(vgpu); - ret = vfio_unregister_notifier(&vgpu->vfio_device, VFIO_IOMMU_NOTIFY, - &vgpu->iommu_notifier); - drm_WARN(&i915->drm, ret, - "vfio_unregister_notifier for iommu failed: %d\n", ret); - debugfs_remove(debugfs_lookup(KVMGT_DEBUGFS_FILENAME, vgpu->debugfs)); kvm_page_track_unregister_notifier(vgpu->vfio_device.kvm, @@ -1610,6 +1572,7 @@ static const struct vfio_device_ops intel_vgpu_dev_ops = { .write = intel_vgpu_write, .mmap = intel_vgpu_mmap, .ioctl = intel_vgpu_ioctl, + .dma_unmap = intel_vgpu_dma_unmap, }; static int intel_vgpu_probe(struct mdev_device *mdev) diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index bc2176421dc5..0047fd88f938 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -33,30 +33,16 @@ static int vfio_ccw_mdev_reset(struct vfio_ccw_private *private) return 0; } -static int vfio_ccw_mdev_notifier(struct notifier_block *nb, - unsigned long action, - void *data) +static void vfio_ccw_dma_unmap(struct vfio_device *vdev, u64 iova, u64 length) { struct vfio_ccw_private *private = - container_of(nb, struct vfio_ccw_private, nb); - - /* - * Vendor drivers MUST unpin pages in response to an - * invalidation. - */ - if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { - struct vfio_iommu_type1_dma_unmap *unmap = data; - - if (!cp_iova_pinned(&private->cp, unmap->iova)) - return NOTIFY_OK; - - if (vfio_ccw_mdev_reset(private)) - return NOTIFY_BAD; + container_of(vdev, struct vfio_ccw_private, vdev); - return NOTIFY_OK; - } + /* Drivers MUST unpin pages in response to an invalidation. */ + if (!cp_iova_pinned(&private->cp, iova)) + return; - return NOTIFY_DONE; + vfio_ccw_mdev_reset(private); } static ssize_t name_show(struct mdev_type *mtype, @@ -154,23 +140,15 @@ static int vfio_ccw_mdev_open_device(struct vfio_device *vdev) { struct vfio_ccw_private *private = container_of(vdev, struct vfio_ccw_private, vdev); - unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; int ret; /* Device cannot simply be opened again from this state */ if (private->state == VFIO_CCW_STATE_NOT_OPER) return -EINVAL; - private->nb.notifier_call = vfio_ccw_mdev_notifier; - - ret = vfio_register_notifier(vdev, VFIO_IOMMU_NOTIFY, - &events, &private->nb); - if (ret) - return ret; - ret = vfio_ccw_register_async_dev_regions(private); if (ret) - goto out_unregister; + return ret; ret = vfio_ccw_register_schib_dev_regions(private); if (ret) @@ -190,7 +168,6 @@ static int vfio_ccw_mdev_open_device(struct vfio_device *vdev) out_unregister: vfio_ccw_unregister_dev_regions(private); - vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY, &private->nb); return ret; } @@ -201,7 +178,6 @@ static void vfio_ccw_mdev_close_device(struct vfio_device *vdev) vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_CLOSE); vfio_ccw_unregister_dev_regions(private); - vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY, &private->nb); } static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private, @@ -624,6 +600,7 @@ static const struct vfio_device_ops vfio_ccw_dev_ops = { .write = vfio_ccw_mdev_write, .ioctl = vfio_ccw_mdev_ioctl, .request = vfio_ccw_mdev_request, + .dma_unmap = vfio_ccw_dma_unmap, }; struct mdev_driver vfio_ccw_mdev_driver = { diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index abac532bf03e..cd24b7fada91 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -73,7 +73,6 @@ struct vfio_ccw_crw { * @state: internal state of the device * @completion: synchronization helper of the I/O completion * @avail: available for creating a mediated device - * @nb: notifier for vfio events * @io_region: MMIO region to input/output I/O arguments/results * @io_mutex: protect against concurrent update of I/O regions * @region: additional regions for other subchannel operations @@ -96,7 +95,6 @@ struct vfio_ccw_private { int state; struct completion *completion; atomic_t avail; - struct notifier_block nb; struct ccw_io_region *io_region; struct mutex io_mutex; struct vfio_ccw_region *region; diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index a7d2a95796d3..bb1a1677c5c2 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -1226,34 +1226,14 @@ static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev, return 0; } -/** - * vfio_ap_mdev_iommu_notifier - IOMMU notifier callback - * - * @nb: The notifier block - * @action: Action to be taken - * @data: data associated with the request - * - * For an UNMAP request, unpin the guest IOVA (the NIB guest address we - * pinned before). Other requests are ignored. - * - * Return: for an UNMAP request, NOFITY_OK; otherwise NOTIFY_DONE. - */ -static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb, - unsigned long action, void *data) +static void vfio_ap_mdev_dma_unmap(struct vfio_device *vdev, u64 iova, + u64 length) { - struct ap_matrix_mdev *matrix_mdev; - - matrix_mdev = container_of(nb, struct ap_matrix_mdev, iommu_notifier); - - if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) { - struct vfio_iommu_type1_dma_unmap *unmap = data; - unsigned long g_pfn = unmap->iova >> PAGE_SHIFT; - - vfio_unpin_pages(&matrix_mdev->vdev, &g_pfn, 1); - return NOTIFY_OK; - } + struct ap_matrix_mdev *matrix_mdev = + container_of(vdev, struct ap_matrix_mdev, vdev); + unsigned long g_pfn = iova >> PAGE_SHIFT; - return NOTIFY_DONE; + vfio_unpin_pages(&matrix_mdev->vdev, &g_pfn, 1); } /** @@ -1380,27 +1360,11 @@ static int vfio_ap_mdev_open_device(struct vfio_device *vdev) { struct ap_matrix_mdev *matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev); - unsigned long events; - int ret; if (!vdev->kvm) return -EINVAL; - ret = vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm); - if (ret) - return ret; - - matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier; - events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; - ret = vfio_register_notifier(vdev, VFIO_IOMMU_NOTIFY, &events, - &matrix_mdev->iommu_notifier); - if (ret) - goto err_kvm; - return 0; - -err_kvm: - vfio_ap_mdev_unset_kvm(matrix_mdev); - return ret; + return vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm); } static void vfio_ap_mdev_close_device(struct vfio_device *vdev) @@ -1408,8 +1372,6 @@ static void vfio_ap_mdev_close_device(struct vfio_device *vdev) struct ap_matrix_mdev *matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev); - vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY, - &matrix_mdev->iommu_notifier); vfio_ap_mdev_unset_kvm(matrix_mdev); } @@ -1461,6 +1423,7 @@ static const struct vfio_device_ops vfio_ap_matrix_dev_ops = { .open_device = vfio_ap_mdev_open_device, .close_device = vfio_ap_mdev_close_device, .ioctl = vfio_ap_mdev_ioctl, + .dma_unmap = vfio_ap_mdev_dma_unmap, }; static struct mdev_driver vfio_ap_matrix_driver = { diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index a26efd804d0d..abb59d59f81b 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -81,8 +81,6 @@ struct ap_matrix { * @node: allows the ap_matrix_mdev struct to be added to a list * @matrix: the adapters, usage domains and control domains assigned to the * mediated matrix device. - * @iommu_notifier: notifier block used for specifying callback function for - * handling the VFIO_IOMMU_NOTIFY_DMA_UNMAP even * @kvm: the struct holding guest's state * @pqap_hook: the function pointer to the interception handler for the * PQAP(AQIC) instruction. @@ -92,7 +90,6 @@ struct ap_matrix_mdev { struct vfio_device vdev; struct list_head node; struct ap_matrix matrix; - struct notifier_block iommu_notifier; struct kvm *kvm; crypto_hook pqap_hook; struct mdev_device *mdev; diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index bd84ca7c5e35..83c375fa2421 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -231,6 +231,9 @@ int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops) { struct vfio_iommu_driver *driver, *tmp; + if (WARN_ON(!ops->register_notifier != !ops->unregister_notifier)) + return -EINVAL; + driver = kzalloc(sizeof(*driver), GFP_KERNEL); if (!driver) return -ENOMEM; @@ -1079,8 +1082,20 @@ static void vfio_device_unassign_container(struct vfio_device *device) up_write(&device->group->group_rwsem); } +static int vfio_iommu_notifier(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct vfio_device *vfio_device = + container_of(nb, struct vfio_device, iommu_nb); + struct vfio_iommu_type1_dma_unmap *unmap = data; + + vfio_device->ops->dma_unmap(vfio_device, unmap->iova, unmap->size); + return NOTIFY_OK; +} + static struct file *vfio_device_open(struct vfio_device *device) { + struct vfio_iommu_driver *iommu_driver; struct file *filep; int ret; @@ -1111,6 +1126,18 @@ static struct file *vfio_device_open(struct vfio_device *device) if (ret) goto err_undo_count; } + + iommu_driver = device->group->container->iommu_driver; + if (device->ops->dma_unmap && iommu_driver && + iommu_driver->ops->register_notifier) { + unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; + + device->iommu_nb.notifier_call = vfio_iommu_notifier; + iommu_driver->ops->register_notifier( + device->group->container->iommu_data, &events, + &device->iommu_nb); + } + up_read(&device->group->group_rwsem); } mutex_unlock(&device->dev_set->lock); @@ -1145,8 +1172,16 @@ static struct file *vfio_device_open(struct vfio_device *device) err_close_device: mutex_lock(&device->dev_set->lock); down_read(&device->group->group_rwsem); - if (device->open_count == 1 && device->ops->close_device) + if (device->open_count == 1 && device->ops->close_device) { device->ops->close_device(device); + + iommu_driver = device->group->container->iommu_driver; + if (device->ops->dma_unmap && iommu_driver && + iommu_driver->ops->unregister_notifier) + iommu_driver->ops->unregister_notifier( + device->group->container->iommu_data, + &device->iommu_nb); + } err_undo_count: up_read(&device->group->group_rwsem); device->open_count--; @@ -1341,12 +1376,20 @@ static const struct file_operations vfio_group_fops = { static int vfio_device_fops_release(struct inode *inode, struct file *filep) { struct vfio_device *device = filep->private_data; + struct vfio_iommu_driver *iommu_driver; mutex_lock(&device->dev_set->lock); vfio_assert_device_open(device); down_read(&device->group->group_rwsem); if (device->open_count == 1 && device->ops->close_device) device->ops->close_device(device); + + iommu_driver = device->group->container->iommu_driver; + if (device->ops->dma_unmap && iommu_driver && + iommu_driver->ops->unregister_notifier) + iommu_driver->ops->unregister_notifier( + device->group->container->iommu_data, + &device->iommu_nb); up_read(&device->group->group_rwsem); device->open_count--; if (device->open_count == 0) @@ -2029,90 +2072,6 @@ int vfio_dma_rw(struct vfio_device *device, dma_addr_t user_iova, void *data, } EXPORT_SYMBOL(vfio_dma_rw); -static int vfio_register_iommu_notifier(struct vfio_group *group, - unsigned long *events, - struct notifier_block *nb) -{ - struct vfio_container *container; - struct vfio_iommu_driver *driver; - int ret; - - lockdep_assert_held_read(&group->group_rwsem); - - container = group->container; - driver = container->iommu_driver; - if (likely(driver && driver->ops->register_notifier)) - ret = driver->ops->register_notifier(container->iommu_data, - events, nb); - else - ret = -ENOTTY; - - return ret; -} - -static int vfio_unregister_iommu_notifier(struct vfio_group *group, - struct notifier_block *nb) -{ - struct vfio_container *container; - struct vfio_iommu_driver *driver; - int ret; - - lockdep_assert_held_read(&group->group_rwsem); - - container = group->container; - driver = container->iommu_driver; - if (likely(driver && driver->ops->unregister_notifier)) - ret = driver->ops->unregister_notifier(container->iommu_data, - nb); - else - ret = -ENOTTY; - - return ret; -} - -int vfio_register_notifier(struct vfio_device *device, - enum vfio_notify_type type, unsigned long *events, - struct notifier_block *nb) -{ - struct vfio_group *group = device->group; - int ret; - - if (!nb || !events || (*events == 0) || - !vfio_assert_device_open(device)) - return -EINVAL; - - switch (type) { - case VFIO_IOMMU_NOTIFY: - ret = vfio_register_iommu_notifier(group, events, nb); - break; - default: - ret = -EINVAL; - } - return ret; -} -EXPORT_SYMBOL(vfio_register_notifier); - -int vfio_unregister_notifier(struct vfio_device *device, - enum vfio_notify_type type, - struct notifier_block *nb) -{ - struct vfio_group *group = device->group; - int ret; - - if (!nb || !vfio_assert_device_open(device)) - return -EINVAL; - - switch (type) { - case VFIO_IOMMU_NOTIFY: - ret = vfio_unregister_iommu_notifier(group, nb); - break; - default: - ret = -EINVAL; - } - return ret; -} -EXPORT_SYMBOL(vfio_unregister_notifier); - /* * Module/class support */ diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index a67130221151..25da02ca1568 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -33,6 +33,9 @@ enum vfio_iommu_notify_type { VFIO_IOMMU_CONTAINER_CLOSE = 0, }; +/* events for register_notifier() */ +#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0) + /** * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks */ |