[PATCH v6 19/20] vfio: mdev: Add device request interface
From: Dave Jiang <dave.jiang@intel.com>
Date: 2021-05-22 00:22:42
Also in:
kvm, lkml
Subsystem:
the rest, vfio driver, vfio mediated device drivers · Maintainers:
Linus Torvalds, Alex Williamson, Kirti Wankhede
Similar to commit 6140a8f56238 ("vfio-pci: Add device request interface").
Add request interface for mdev to allow userspace to opt in to receive
a device request notification, indicating that the device should be
released.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/vfio/mdev/mdev_irqs.c | 23 +++++++++++++++++++++++
include/linux/mdev.h | 15 +++++++++++++++
2 files changed, 38 insertions(+)
diff --git a/drivers/vfio/mdev/mdev_irqs.c b/drivers/vfio/mdev/mdev_irqs.c
index ed2d11a7c729..11b1f8df020c 100644
--- a/drivers/vfio/mdev/mdev_irqs.c
+++ b/drivers/vfio/mdev/mdev_irqs.c@@ -316,3 +316,26 @@ void mdev_irqs_free(struct mdev_device *mdev) memset(&mdev->mdev_irq, 0, sizeof(mdev->mdev_irq)); } EXPORT_SYMBOL_GPL(mdev_irqs_free); + +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count) +{ + struct device *dev = vdev->dev; + struct mdev_device *mdev = to_mdev_device(dev); + + if (mdev->req_trigger) { + dev_dbg(dev, "Requesting device from user\n"); + eventfd_signal(mdev->req_trigger, 1); + } +} +EXPORT_SYMBOL_GPL(vfio_mdev_request); + +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data) +{ + if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1) + return -EINVAL; + + return vfio_set_ctx_trigger_single(&mdev->req_trigger, count, flags, data); +} +EXPORT_SYMBOL_GPL(vfio_mdev_set_req_trigger);
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 035c021e8068..db73d58f5e81 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h@@ -11,6 +11,8 @@ #define MDEV_H #include <linux/irqbypass.h> +#include <linux/eventfd.h> +#include <linux/vfio.h> struct mdev_type;
@@ -38,6 +40,7 @@ struct mdev_device { struct device *iommu_device; struct mutex creation_lock; struct mdev_irq mdev_irq; + struct eventfd_ctx *req_trigger; }; static inline struct mdev_device *irq_to_mdev(struct mdev_irq *mdev_irq)
@@ -131,6 +134,10 @@ void mdev_msix_send_signal(struct mdev_device *mdev, int vector); int mdev_irqs_init(struct mdev_device *mdev, int num, bool *ims_map); void mdev_irqs_free(struct mdev_device *mdev); void mdev_irqs_set_pasid(struct mdev_device *mdev, u32 pasid); +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count); +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data); #else static inline int mdev_set_msix_trigger(struct mdev_device *mdev, unsigned int index, unsigned int start, unsigned int count, u32 flags,
@@ -148,6 +155,14 @@ static inline int mdev_irqs_init(struct mdev_device *mdev, int num, bool *ims_ma void mdev_irqs_free(struct mdev_device *mdev) {} void mdev_irqs_set_pasid(struct mdev_device *mdev, u32 pasid) {} +void vfio_mdev_request(struct vfio_device *vdev, unsigned int count) {} + +int vfio_mdev_set_req_trigger(struct mdev_device *mdev, unsigned int index, + unsigned int start, unsigned int count, u32 flags, + void *data) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_VFIO_MDEV_IMS */ #endif /* MDEV_H */