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[Qemu-devel] [RFC PATCH 2/3] vfio: ccw: introduce channel path irq


From: Dong Jia Shi
Subject: [Qemu-devel] [RFC PATCH 2/3] vfio: ccw: introduce channel path irq
Date: Thu, 11 Jan 2018 04:04:20 +0100

This introduces a new irq for vfio-ccw to provide channel path
related event for userland.

Signed-off-by: Dong Jia Shi <address@hidden>
---
 drivers/s390/cio/vfio_ccw_ops.c     | 29 +++++++++++++++++++++--------
 drivers/s390/cio/vfio_ccw_private.h |  2 ++
 include/uapi/linux/vfio.h           |  1 +
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 9528fce2e7d9..972cfc8834fc 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -275,17 +275,20 @@ static int vfio_ccw_mdev_get_region_info(struct 
vfio_region_info *info,
 
 static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
 {
-       if (info->index != VFIO_CCW_IO_IRQ_INDEX)
+       switch (info->index) {
+       case VFIO_CCW_IO_IRQ_INDEX:
+       case VFIO_CCW_CHP_IRQ_INDEX:
+               info->count = 1;
+               info->flags = VFIO_IRQ_INFO_EVENTFD;
+               return 0;
+       default:
                return -EINVAL;
-
-       info->count = 1;
-       info->flags = VFIO_IRQ_INFO_EVENTFD;
-
-       return 0;
+       }
 }
 
 static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
                                  uint32_t flags,
+                                 unsigned index,
                                  void __user *data)
 {
        struct vfio_ccw_private *private;
@@ -295,7 +298,17 @@ static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
                return -EINVAL;
 
        private = dev_get_drvdata(mdev_parent_dev(mdev));
-       ctx = &private->io_trigger;
+
+       switch (index) {
+       case VFIO_CCW_IO_IRQ_INDEX:
+               ctx = &private->io_trigger;
+               break;
+       case VFIO_CCW_CHP_IRQ_INDEX:
+               ctx = &private->chp_trigger;
+               break;
+       default:
+               return -EINVAL;
+       }
 
        switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
        case VFIO_IRQ_SET_DATA_NONE:
@@ -433,7 +446,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
                        return ret;
 
                data = (void __user *)(arg + minsz);
-               return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data);
+               return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, hdr.index, data);
        }
        case VFIO_DEVICE_RESET:
                return vfio_ccw_mdev_reset(mdev);
diff --git a/drivers/s390/cio/vfio_ccw_private.h 
b/drivers/s390/cio/vfio_ccw_private.h
index 460c8b90d834..da86f82dd7b9 100644
--- a/drivers/s390/cio/vfio_ccw_private.h
+++ b/drivers/s390/cio/vfio_ccw_private.h
@@ -33,6 +33,7 @@
  * @irb: irb info received from interrupt
  * @scsw: scsw info
  * @io_trigger: eventfd ctx for signaling userspace I/O results
+ * @chp_trigger: eventfd ctx for signaling userspace chp event
  * @io_work: work for deferral process of I/O handling
  */
 struct vfio_ccw_private {
@@ -50,6 +51,7 @@ struct vfio_ccw_private {
        union scsw              scsw;
 
        struct eventfd_ctx      *io_trigger;
+       struct eventfd_ctx      *chp_trigger;
        struct work_struct      io_work;
 } __aligned(8);
 
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index c60244debf71..179a7492d53a 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -463,6 +463,7 @@ enum {
 
 enum {
        VFIO_CCW_IO_IRQ_INDEX,
+       VFIO_CCW_CHP_IRQ_INDEX,
        VFIO_CCW_NUM_IRQS
 };
 
-- 
2.13.5




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