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vfio-mdev: Make mdev_device private and abstract interfaces

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Abstract access to mdev_device so that we can define which interfaces
are public rather than relying on comments in the structure.

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Jike Song <jike.song@intel.com>
Reviewed by: Kirti Wankhede <kwankhede@nvidia.com>
tirimbino
Alex Williamson 8 years ago
parent 9372e6feaa
commit 99e3123e3d
5 changed files with 71 additions and 45 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 18
      drivers/gpu/drm/i915/gvt/kvmgt.c
  2. 30
      drivers/vfio/mdev/mdev_core.c
  3. 13
      drivers/vfio/mdev/mdev_private.h
  4. 31
      include/linux/mdev.h
  5. 24
      samples/vfio-mdev/mtty.c

18
drivers/gpu/drm/i915/gvt/kvmgt.c
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@ -166,7 +166,7 @@ static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
{
struct device *dev = &vgpu->vdev.mdev->dev;
struct device *dev = mdev_dev(vgpu->vdev.mdev);
struct gvt_dma *this;
unsigned long g1;
int rc;
@ -195,7 +195,7 @@ static void gvt_cache_destroy(struct intel_vgpu *vgpu)
{
struct gvt_dma *dma;
struct rb_node *node = NULL;
struct device *dev = &vgpu->vdev.mdev->dev;
struct device *dev = mdev_dev(vgpu->vdev.mdev);
unsigned long gfn;
mutex_lock(&vgpu->vdev.cache_lock);
@ -418,7 +418,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
mdev_set_drvdata(mdev, vgpu);
gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
dev_name(&mdev->dev));
dev_name(mdev_dev(mdev)));
return 0;
}
@ -482,7 +482,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
ret = vfio_register_notifier(&mdev->dev, VFIO_IOMMU_NOTIFY, &events,
ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
&vgpu->vdev.iommu_notifier);
if (ret != 0) {
gvt_err("vfio_register_notifier for iommu failed: %d\n", ret);
@ -490,7 +490,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
}
events = VFIO_GROUP_NOTIFY_SET_KVM;
ret = vfio_register_notifier(&mdev->dev, VFIO_GROUP_NOTIFY, &events,
ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
&vgpu->vdev.group_notifier);
if (ret != 0) {
gvt_err("vfio_register_notifier for group failed: %d\n", ret);
@ -500,7 +500,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
return kvmgt_guest_init(mdev);
undo_iommu:
vfio_unregister_notifier(&mdev->dev, VFIO_IOMMU_NOTIFY,
vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
&vgpu->vdev.iommu_notifier);
out:
return ret;
@ -513,9 +513,9 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
if (!handle_valid(vgpu->handle))
return;
vfio_unregister_notifier(&vgpu->vdev.mdev->dev, VFIO_IOMMU_NOTIFY,
vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
&vgpu->vdev.iommu_notifier);
vfio_unregister_notifier(&vgpu->vdev.mdev->dev, VFIO_GROUP_NOTIFY,
vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
&vgpu->vdev.group_notifier);
info = (struct kvmgt_guest_info *)vgpu->handle;
@ -1372,7 +1372,7 @@ static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
return pfn;
pfn = INTEL_GVT_INVALID_ADDR;
dev = &info->vgpu->vdev.mdev->dev;
dev = mdev_dev(info->vgpu->vdev.mdev);
rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
if (rc != 1) {
gvt_err("vfio_pin_pages failed for gfn 0x%lx: %d\n", gfn, rc);

30
drivers/vfio/mdev/mdev_core.c
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@ -36,6 +36,36 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
}
EXPORT_SYMBOL(mdev_parent_dev);
void *mdev_get_drvdata(struct mdev_device *mdev)
{
return mdev->driver_data;
}
EXPORT_SYMBOL(mdev_get_drvdata);
void mdev_set_drvdata(struct mdev_device *mdev, void *data)
{
mdev->driver_data = data;
}
EXPORT_SYMBOL(mdev_set_drvdata);
struct device *mdev_dev(struct mdev_device *mdev)
{
return &mdev->dev;
}
EXPORT_SYMBOL(mdev_dev);
struct mdev_device *mdev_from_dev(struct device *dev)
{
return dev_is_mdev(dev) ? to_mdev_device(dev) : NULL;
}
EXPORT_SYMBOL(mdev_from_dev);
uuid_le mdev_uuid(struct mdev_device *mdev)
{
return mdev->uuid;
}
EXPORT_SYMBOL(mdev_uuid);
static int _find_mdev_device(struct device *dev, void *data)
{
struct mdev_device *mdev;

13
drivers/vfio/mdev/mdev_private.h
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@ -26,6 +26,19 @@ struct mdev_parent {
struct list_head type_list;
};
struct mdev_device {
struct device dev;
struct mdev_parent *parent;
uuid_le uuid;
void *driver_data;
struct kref ref;
struct list_head next;
struct kobject *type_kobj;
};
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
struct mdev_type {
struct kobject kobj;
struct kobject *devices_kobj;

31
include/linux/mdev.h
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@ -13,18 +13,7 @@
#ifndef MDEV_H
#define MDEV_H
/* Mediated device */
struct mdev_device {
struct device dev;
struct mdev_parent *parent;
uuid_le uuid;
void *driver_data;
/* internal */
struct kref ref;
struct list_head next;
struct kobject *type_kobj;
};
struct mdev_device;
/**
* struct mdev_parent_ops - Structure to be registered for each parent device to
@ -75,7 +64,6 @@ struct mdev_device {
* Parent device that support mediated device should be registered with mdev
* module with mdev_parent_ops structure.
**/
struct mdev_parent_ops {
struct module *owner;
const struct attribute_group **dev_attr_groups;
@ -129,22 +117,13 @@ struct mdev_driver {
};
#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
static inline void *mdev_get_drvdata(struct mdev_device *mdev)
{
return mdev->driver_data;
}
static inline void mdev_set_drvdata(struct mdev_device *mdev, void *data)
{
mdev->driver_data = data;
}
extern void *mdev_get_drvdata(struct mdev_device *mdev);
extern void mdev_set_drvdata(struct mdev_device *mdev, void *data);
extern uuid_le mdev_uuid(struct mdev_device *mdev);
extern struct bus_type mdev_bus_type;
#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
extern int mdev_register_device(struct device *dev,
const struct mdev_parent_ops *ops);
extern void mdev_unregister_device(struct device *dev);
@ -153,5 +132,7 @@ extern int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
extern void mdev_unregister_driver(struct mdev_driver *drv);
extern struct device *mdev_parent_dev(struct mdev_device *mdev);
extern struct device *mdev_dev(struct mdev_device *mdev);
extern struct mdev_device *mdev_from_dev(struct device *dev);
#endif /* MDEV_H */

24
samples/vfio-mdev/mtty.c
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@ -164,7 +164,7 @@ static struct mdev_state *find_mdev_state_by_uuid(uuid_le uuid)
struct mdev_state *mds;
list_for_each_entry(mds, &mdev_devices_list, next) {
if (uuid_le_cmp(mds->mdev->uuid, uuid) == 0)
if (uuid_le_cmp(mdev_uuid(mds->mdev), uuid) == 0)
return mds;
}
@ -341,7 +341,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
pr_err("Serial port %d: Fifo level trigger\n",
index);
#endif
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
}
} else {
#if defined(DEBUG_INTR)
@ -355,7 +356,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
*/
if (mdev_state->s[index].uart_reg[UART_IER] &
UART_IER_RLSI)
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
}
mutex_unlock(&mdev_state->rxtx_lock);
break;
@ -374,7 +376,8 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
pr_err("Serial port %d: IER_THRI write\n",
index);
#endif
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
}
mutex_unlock(&mdev_state->rxtx_lock);
@ -445,7 +448,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
#if defined(DEBUG_INTR)
pr_err("Serial port %d: MCR_OUT2 write\n", index);
#endif
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
}
if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) &&
@ -453,7 +456,7 @@ static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
#if defined(DEBUG_INTR)
pr_err("Serial port %d: MCR RTS/DTR write\n", index);
#endif
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
}
break;
@ -504,7 +507,8 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,
#endif
if (mdev_state->s[index].uart_reg[UART_IER] &
UART_IER_THRI)
mtty_trigger_interrupt(mdev_state->mdev->uuid);
mtty_trigger_interrupt(
mdev_uuid(mdev_state->mdev));
}
mutex_unlock(&mdev_state->rxtx_lock);
@ -1298,10 +1302,8 @@ static ssize_t
sample_mdev_dev_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mdev_device *mdev = to_mdev_device(dev);
if (mdev)
return sprintf(buf, "This is MDEV %s\n", dev_name(&mdev->dev));
if (mdev_from_dev(dev))
return sprintf(buf, "This is MDEV %s\n", dev_name(dev));
return sprintf(buf, "\n");
}

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