This is a more complicated conversion because vfio_ccw is sharing the vfio_device between both the mdev_device, its vfio_device and the css_driver.
The mdev is a singleton, and the reason for this sharing is so the extra css_driver function callbacks to be delivered to the vfio_device implementation.
This keeps things as they are, with the css_driver allocating the singleton, not the mdev_driver. Following patches work to clean this further.
Embed the vfio_device in the vfio_ccw_private and instantiate it as a vfio_device when the mdev probes. The drvdata of both the css_device and the mdev_device point at the private, and container_of is used to get it back from the vfio_device.
Signed-off-by: Jason Gunthorpe jgg@nvidia.com --- drivers/s390/cio/vfio_ccw_drv.c | 21 ++++-- drivers/s390/cio/vfio_ccw_ops.c | 107 +++++++++++++++++----------- drivers/s390/cio/vfio_ccw_private.h | 5 ++ 3 files changed, 85 insertions(+), 48 deletions(-)
diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c index 1e8d3151e5480e..396e815f81f8a4 100644 --- a/drivers/s390/cio/vfio_ccw_drv.c +++ b/drivers/s390/cio/vfio_ccw_drv.c @@ -469,7 +469,7 @@ static int __init vfio_ccw_sch_init(void) vfio_ccw_work_q = create_singlethread_workqueue("vfio-ccw"); if (!vfio_ccw_work_q) { ret = -ENOMEM; - goto out_err; + goto out_regions; }
vfio_ccw_io_region = kmem_cache_create_usercopy("vfio_ccw_io_region", @@ -478,7 +478,7 @@ static int __init vfio_ccw_sch_init(void) sizeof(struct ccw_io_region), NULL); if (!vfio_ccw_io_region) { ret = -ENOMEM; - goto out_err; + goto out_regions; }
vfio_ccw_cmd_region = kmem_cache_create_usercopy("vfio_ccw_cmd_region", @@ -487,7 +487,7 @@ static int __init vfio_ccw_sch_init(void) sizeof(struct ccw_cmd_region), NULL); if (!vfio_ccw_cmd_region) { ret = -ENOMEM; - goto out_err; + goto out_regions; }
vfio_ccw_schib_region = kmem_cache_create_usercopy("vfio_ccw_schib_region", @@ -497,7 +497,7 @@ static int __init vfio_ccw_sch_init(void)
if (!vfio_ccw_schib_region) { ret = -ENOMEM; - goto out_err; + goto out_regions; }
vfio_ccw_crw_region = kmem_cache_create_usercopy("vfio_ccw_crw_region", @@ -507,19 +507,25 @@ static int __init vfio_ccw_sch_init(void)
if (!vfio_ccw_crw_region) { ret = -ENOMEM; - goto out_err; + goto out_regions; }
+ ret = mdev_register_driver(&vfio_ccw_mdev_driver); + if (ret) + goto out_regions; + isc_register(VFIO_CCW_ISC); ret = css_driver_register(&vfio_ccw_sch_driver); if (ret) { isc_unregister(VFIO_CCW_ISC); - goto out_err; + goto out_driver; }
return ret;
-out_err: +out_driver: + mdev_unregister_driver(&vfio_ccw_mdev_driver); +out_regions: vfio_ccw_destroy_regions(); destroy_workqueue(vfio_ccw_work_q); vfio_ccw_debug_exit(); @@ -528,6 +534,7 @@ static int __init vfio_ccw_sch_init(void)
static void __exit vfio_ccw_sch_exit(void) { + mdev_unregister_driver(&vfio_ccw_mdev_driver); css_driver_unregister(&vfio_ccw_sch_driver); isc_unregister(VFIO_CCW_ISC); vfio_ccw_destroy_regions(); diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c index 1edbea9de0ec42..3a66e4fb18244c 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -17,6 +17,8 @@
#include "vfio_ccw_private.h"
+static const struct vfio_device_ops vfio_ccw_dev_ops; + static int vfio_ccw_mdev_reset(struct vfio_ccw_private *private) { struct subchannel *sch; @@ -111,10 +113,10 @@ static struct attribute_group *mdev_type_groups[] = { NULL, };
-static int vfio_ccw_mdev_create(struct mdev_device *mdev) +static int vfio_ccw_mdev_probe(struct mdev_device *mdev) { - struct vfio_ccw_private *private = - dev_get_drvdata(mdev_parent_dev(mdev)); + struct vfio_ccw_private *private = dev_get_drvdata(mdev->dev.parent); + int ret;
if (private->state == VFIO_CCW_STATE_NOT_OPER) return -ENODEV; @@ -122,6 +124,10 @@ static int vfio_ccw_mdev_create(struct mdev_device *mdev) if (atomic_dec_if_positive(&private->avail) < 0) return -EPERM;
+ memset(&private->vdev, 0, sizeof(private->vdev)); + vfio_init_group_dev(&private->vdev, &mdev->dev, + &vfio_ccw_dev_ops); + private->mdev = mdev; private->state = VFIO_CCW_STATE_IDLE;
@@ -130,19 +136,31 @@ static int vfio_ccw_mdev_create(struct mdev_device *mdev) private->sch->schid.ssid, private->sch->schid.sch_no);
+ ret = vfio_register_group_dev(&private->vdev); + if (ret) + goto err_atomic; + dev_set_drvdata(&mdev->dev, private); return 0; + +err_atomic: + vfio_uninit_group_dev(&private->vdev); + atomic_inc(&private->avail); + private->mdev = NULL; + private->state = VFIO_CCW_STATE_IDLE; + return ret; }
-static int vfio_ccw_mdev_remove(struct mdev_device *mdev) +static void vfio_ccw_mdev_remove(struct mdev_device *mdev) { - struct vfio_ccw_private *private = - dev_get_drvdata(mdev_parent_dev(mdev)); + struct vfio_ccw_private *private = dev_get_drvdata(mdev->dev.parent);
VFIO_CCW_MSG_EVENT(2, "mdev %pUl, sch %x.%x.%04x: remove\n", mdev_uuid(mdev), private->sch->schid.cssid, private->sch->schid.ssid, private->sch->schid.sch_no);
+ vfio_unregister_group_dev(&private->vdev); + if ((private->state != VFIO_CCW_STATE_NOT_OPER) && (private->state != VFIO_CCW_STATE_STANDBY)) { if (!vfio_ccw_sch_quiesce(private->sch)) @@ -150,23 +168,22 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev) /* The state will be NOT_OPER on error. */ }
+ vfio_uninit_group_dev(&private->vdev); cp_free(&private->cp); private->mdev = NULL; atomic_inc(&private->avail); - - return 0; }
-static int vfio_ccw_mdev_open_device(struct mdev_device *mdev) +static int vfio_ccw_mdev_open_device(struct vfio_device *vdev) { struct vfio_ccw_private *private = - dev_get_drvdata(mdev_parent_dev(mdev)); + container_of(vdev, struct vfio_ccw_private, vdev); unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP; int ret;
private->nb.notifier_call = vfio_ccw_mdev_notifier;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, + ret = vfio_register_notifier(vdev->dev, VFIO_IOMMU_NOTIFY, &events, &private->nb); if (ret) return ret; @@ -187,15 +204,15 @@ static int vfio_ccw_mdev_open_device(struct mdev_device *mdev)
out_unregister: vfio_ccw_unregister_dev_regions(private); - vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, + vfio_unregister_notifier(vdev->dev, VFIO_IOMMU_NOTIFY, &private->nb); return ret; }
-static void vfio_ccw_mdev_close_device(struct mdev_device *mdev) +static void vfio_ccw_mdev_close_device(struct vfio_device *vdev) { struct vfio_ccw_private *private = - dev_get_drvdata(mdev_parent_dev(mdev)); + container_of(vdev, struct vfio_ccw_private, vdev);
if ((private->state != VFIO_CCW_STATE_NOT_OPER) && (private->state != VFIO_CCW_STATE_STANDBY)) { @@ -206,8 +223,7 @@ static void vfio_ccw_mdev_close_device(struct mdev_device *mdev)
cp_free(&private->cp); vfio_ccw_unregister_dev_regions(private); - vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, - &private->nb); + vfio_unregister_notifier(vdev->dev, VFIO_IOMMU_NOTIFY, &private->nb); }
static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private, @@ -231,15 +247,14 @@ static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private, return ret; }
-static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev, +static ssize_t vfio_ccw_mdev_read(struct vfio_device *vdev, char __user *buf, size_t count, loff_t *ppos) { + struct vfio_ccw_private *private = + container_of(vdev, struct vfio_ccw_private, vdev); unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos); - struct vfio_ccw_private *private; - - private = dev_get_drvdata(mdev_parent_dev(mdev));
if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions) return -EINVAL; @@ -284,15 +299,14 @@ static ssize_t vfio_ccw_mdev_write_io_region(struct vfio_ccw_private *private, return ret; }
-static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev, +static ssize_t vfio_ccw_mdev_write(struct vfio_device *vdev, const char __user *buf, size_t count, loff_t *ppos) { + struct vfio_ccw_private *private = + container_of(vdev, struct vfio_ccw_private, vdev); unsigned int index = VFIO_CCW_OFFSET_TO_INDEX(*ppos); - struct vfio_ccw_private *private; - - private = dev_get_drvdata(mdev_parent_dev(mdev));
if (index >= VFIO_CCW_NUM_REGIONS + private->num_regions) return -EINVAL; @@ -510,12 +524,12 @@ void vfio_ccw_unregister_dev_regions(struct vfio_ccw_private *private) private->region = NULL; }
-static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev, +static ssize_t vfio_ccw_mdev_ioctl(struct vfio_device *vdev, unsigned int cmd, unsigned long arg) { struct vfio_ccw_private *private = - dev_get_drvdata(mdev_parent_dev(mdev)); + container_of(vdev, struct vfio_ccw_private, vdev); int ret = 0; unsigned long minsz;
@@ -606,37 +620,48 @@ 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) +static void vfio_ccw_mdev_request(struct vfio_device *vdev, unsigned int count) { - struct vfio_ccw_private *private = dev_get_drvdata(mdev_parent_dev(mdev)); - - if (!private) - return; + struct vfio_ccw_private *private = + container_of(vdev, struct vfio_ccw_private, vdev); + struct device *dev = vdev->dev;
if (private->req_trigger) { if (!(count % 10)) - dev_notice_ratelimited(mdev_dev(private->mdev), + dev_notice_ratelimited(dev, "Relaying device request to user (#%u)\n", count);
eventfd_signal(private->req_trigger, 1); } else if (count == 0) { - dev_notice(mdev_dev(private->mdev), + dev_notice(dev, "No device request channel registered, blocked until released by user\n"); } }
+static const struct vfio_device_ops vfio_ccw_dev_ops = { + .open_device = vfio_ccw_mdev_open_device, + .close_device = vfio_ccw_mdev_close_device, + .read = vfio_ccw_mdev_read, + .write = vfio_ccw_mdev_write, + .ioctl = vfio_ccw_mdev_ioctl, + .request = vfio_ccw_mdev_request, +}; + +struct mdev_driver vfio_ccw_mdev_driver = { + .driver = { + .name = "vfio_ccw_mdev", + .owner = THIS_MODULE, + .mod_name = KBUILD_MODNAME, + }, + .probe = vfio_ccw_mdev_probe, + .remove = vfio_ccw_mdev_remove, +}; + static const struct mdev_parent_ops vfio_ccw_mdev_ops = { .owner = THIS_MODULE, + .device_driver = &vfio_ccw_mdev_driver, .supported_type_groups = mdev_type_groups, - .create = vfio_ccw_mdev_create, - .remove = vfio_ccw_mdev_remove, - .open_device = vfio_ccw_mdev_open_device, - .close_device = vfio_ccw_mdev_close_device, - .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 b2c762eb42b9bb..7272eb78861244 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -17,6 +17,7 @@ #include <linux/eventfd.h> #include <linux/workqueue.h> #include <linux/vfio_ccw.h> +#include <linux/vfio.h> #include <asm/crw.h> #include <asm/debug.h>
@@ -67,6 +68,7 @@ struct vfio_ccw_crw {
/** * struct vfio_ccw_private + * @vdev: Embedded VFIO device * @sch: pointer to the subchannel * @state: internal state of the device * @completion: synchronization helper of the I/O completion @@ -90,6 +92,7 @@ struct vfio_ccw_crw { * @crw_work: work for deferral process of CRW handling */ struct vfio_ccw_private { + struct vfio_device vdev; struct subchannel *sch; int state; struct completion *completion; @@ -121,6 +124,8 @@ extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
+extern struct mdev_driver vfio_ccw_mdev_driver; + /* * States of the device statemachine. */