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authorLinus Torvalds <torvalds@linux-foundation.org>2020-12-16 15:51:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-16 15:51:15 -0800
commit0c71cc04eb180c4b701cbe821635f2a122926065 (patch)
tree187cbf51f65b95fd05d2803f89672d8edb36cfd6 /drivers/s390
parentde925e2fbb44eed8a2a7ce166b485fed5eae01aa (diff)
parentbdfae1c9a913930eae5ea506733aa7c285e12a06 (diff)
Merge tag 'vfio-v5.11-rc1' of git://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson: - Fix uninitialized list walk in error path (Eric Auger) - Use io_remap_pfn_range() (Jason Gunthorpe) - Allow fallback support for NVLink on POWER8 (Alexey Kardashevskiy) - Enable mdev request interrupt with CCW support (Eric Farman) - Enable interface to iommu_domain from vfio_group (Lu Baolu) * tag 'vfio-v5.11-rc1' of git://github.com/awilliam/linux-vfio: vfio/type1: Add vfio_group_iommu_domain() vfio-ccw: Wire in the request callback vfio-mdev: Wire in a request handler for mdev parent vfio/pci/nvlink2: Do not attempt NPU2 setup on POWER8NVL NPU vfio-pci: Use io_remap_pfn_range() for PCI IO memory vfio/pci: Move dummy_resources_list init in vfio_pci_probe()
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/vfio_ccw_ops.c26
-rw-r--r--drivers/s390/cio/vfio_ccw_private.h4
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 8b3ed5b45277..68106be4ba7a 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -394,6 +394,7 @@ static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
switch (info->index) {
case VFIO_CCW_IO_IRQ_INDEX:
case VFIO_CCW_CRW_IRQ_INDEX:
+ case VFIO_CCW_REQ_IRQ_INDEX:
info->count = 1;
info->flags = VFIO_IRQ_INFO_EVENTFD;
break;
@@ -424,6 +425,9 @@ static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
case VFIO_CCW_CRW_IRQ_INDEX:
ctx = &private->crw_trigger;
break;
+ case VFIO_CCW_REQ_IRQ_INDEX:
+ ctx = &private->req_trigger;
+ break;
default:
return -EINVAL;
}
@@ -607,6 +611,27 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
}
}
+/* Request removal of the device*/
+static void vfio_ccw_mdev_request(struct mdev_device *mdev, unsigned int count)
+{
+ struct vfio_ccw_private *private = dev_get_drvdata(mdev_parent_dev(mdev));
+
+ if (!private)
+ return;
+
+ if (private->req_trigger) {
+ if (!(count % 10))
+ dev_notice_ratelimited(mdev_dev(private->mdev),
+ "Relaying device request to user (#%u)\n",
+ count);
+
+ eventfd_signal(private->req_trigger, 1);
+ } else if (count == 0) {
+ dev_notice(mdev_dev(private->mdev),
+ "No device request channel registered, blocked until released by user\n");
+ }
+}
+
static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
.owner = THIS_MODULE,
.supported_type_groups = mdev_type_groups,
@@ -617,6 +642,7 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
.read = vfio_ccw_mdev_read,
.write = vfio_ccw_mdev_write,
.ioctl = vfio_ccw_mdev_ioctl,
+ .request = vfio_ccw_mdev_request,
};
int vfio_ccw_mdev_reg(struct subchannel *sch)
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h
index 8723156b29ea..b2c762eb42b9 100644
--- a/drivers/s390/cio/vfio_ccw_private.h
+++ b/drivers/s390/cio/vfio_ccw_private.h
@@ -84,7 +84,10 @@ struct vfio_ccw_crw {
* @irb: irb info received from interrupt
* @scsw: scsw info
* @io_trigger: eventfd ctx for signaling userspace I/O results
+ * @crw_trigger: eventfd ctx for signaling userspace CRW information
+ * @req_trigger: eventfd ctx for signaling userspace to return device
* @io_work: work for deferral process of I/O handling
+ * @crw_work: work for deferral process of CRW handling
*/
struct vfio_ccw_private {
struct subchannel *sch;
@@ -108,6 +111,7 @@ struct vfio_ccw_private {
struct eventfd_ctx *io_trigger;
struct eventfd_ctx *crw_trigger;
+ struct eventfd_ctx *req_trigger;
struct work_struct io_work;
struct work_struct crw_work;
} __aligned(8);