mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
vfio iommu: Add blocking notifier to notify DMA_UNMAP
Added blocking notifier to IOMMU TYPE1 driver to notify vendor drivers about DMA_UNMAP. Exported two APIs vfio_register_notifier() and vfio_unregister_notifier(). Notifier should be registered, if external user wants to use vfio_pin_pages()/vfio_unpin_pages() APIs to pin/unpin pages. Vendor driver should use VFIO_IOMMU_NOTIFY_DMA_UNMAP action to invalidate mappings. Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com> Signed-off-by: Neo Jia <cjia@nvidia.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
parent
a54eb55045
commit
c086de818d
3 changed files with 146 additions and 13 deletions
|
@ -1901,6 +1901,79 @@ int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage)
|
|||
}
|
||||
EXPORT_SYMBOL(vfio_unpin_pages);
|
||||
|
||||
int vfio_register_notifier(struct device *dev, struct notifier_block *nb)
|
||||
{
|
||||
struct vfio_container *container;
|
||||
struct vfio_group *group;
|
||||
struct vfio_iommu_driver *driver;
|
||||
int ret;
|
||||
|
||||
if (!dev || !nb)
|
||||
return -EINVAL;
|
||||
|
||||
group = vfio_group_get_from_dev(dev);
|
||||
if (IS_ERR(group))
|
||||
return PTR_ERR(group);
|
||||
|
||||
ret = vfio_group_add_container_user(group);
|
||||
if (ret)
|
||||
goto err_register_nb;
|
||||
|
||||
container = group->container;
|
||||
down_read(&container->group_lock);
|
||||
|
||||
driver = container->iommu_driver;
|
||||
if (likely(driver && driver->ops->register_notifier))
|
||||
ret = driver->ops->register_notifier(container->iommu_data, nb);
|
||||
else
|
||||
ret = -ENOTTY;
|
||||
|
||||
up_read(&container->group_lock);
|
||||
vfio_group_try_dissolve_container(group);
|
||||
|
||||
err_register_nb:
|
||||
vfio_group_put(group);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(vfio_register_notifier);
|
||||
|
||||
int vfio_unregister_notifier(struct device *dev, struct notifier_block *nb)
|
||||
{
|
||||
struct vfio_container *container;
|
||||
struct vfio_group *group;
|
||||
struct vfio_iommu_driver *driver;
|
||||
int ret;
|
||||
|
||||
if (!dev || !nb)
|
||||
return -EINVAL;
|
||||
|
||||
group = vfio_group_get_from_dev(dev);
|
||||
if (IS_ERR(group))
|
||||
return PTR_ERR(group);
|
||||
|
||||
ret = vfio_group_add_container_user(group);
|
||||
if (ret)
|
||||
goto err_unregister_nb;
|
||||
|
||||
container = group->container;
|
||||
down_read(&container->group_lock);
|
||||
|
||||
driver = container->iommu_driver;
|
||||
if (likely(driver && driver->ops->unregister_notifier))
|
||||
ret = driver->ops->unregister_notifier(container->iommu_data,
|
||||
nb);
|
||||
else
|
||||
ret = -ENOTTY;
|
||||
|
||||
up_read(&container->group_lock);
|
||||
vfio_group_try_dissolve_container(group);
|
||||
|
||||
err_unregister_nb:
|
||||
vfio_group_put(group);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(vfio_unregister_notifier);
|
||||
|
||||
/**
|
||||
* Module/class support
|
||||
*/
|
||||
|
|
|
@ -38,6 +38,7 @@
|
|||
#include <linux/workqueue.h>
|
||||
#include <linux/pid_namespace.h>
|
||||
#include <linux/mdev.h>
|
||||
#include <linux/notifier.h>
|
||||
|
||||
#define DRIVER_VERSION "0.2"
|
||||
#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
|
||||
|
@ -60,6 +61,7 @@ struct vfio_iommu {
|
|||
struct vfio_domain *external_domain; /* domain for external user */
|
||||
struct mutex lock;
|
||||
struct rb_root dma_list;
|
||||
struct blocking_notifier_head notifier;
|
||||
bool v2;
|
||||
bool nesting;
|
||||
};
|
||||
|
@ -561,7 +563,8 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
|
|||
|
||||
mutex_lock(&iommu->lock);
|
||||
|
||||
if (!iommu->external_domain) {
|
||||
/* Fail if notifier list is empty */
|
||||
if ((!iommu->external_domain) || (!iommu->notifier.head)) {
|
||||
ret = -EINVAL;
|
||||
goto pin_done;
|
||||
}
|
||||
|
@ -776,9 +779,9 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
|
|||
struct vfio_iommu_type1_dma_unmap *unmap)
|
||||
{
|
||||
uint64_t mask;
|
||||
struct vfio_dma *dma;
|
||||
struct vfio_dma *dma, *dma_last = NULL;
|
||||
size_t unmapped = 0;
|
||||
int ret = 0;
|
||||
int ret = 0, retries = 0;
|
||||
|
||||
mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
|
||||
|
||||
|
@ -788,7 +791,7 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
|
|||
return -EINVAL;
|
||||
|
||||
WARN_ON(mask & PAGE_MASK);
|
||||
|
||||
again:
|
||||
mutex_lock(&iommu->lock);
|
||||
|
||||
/*
|
||||
|
@ -844,6 +847,32 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
|
|||
*/
|
||||
if (dma->task->mm != current->mm)
|
||||
break;
|
||||
|
||||
if (!RB_EMPTY_ROOT(&dma->pfn_list)) {
|
||||
struct vfio_iommu_type1_dma_unmap nb_unmap;
|
||||
|
||||
if (dma_last == dma) {
|
||||
BUG_ON(++retries > 10);
|
||||
} else {
|
||||
dma_last = dma;
|
||||
retries = 0;
|
||||
}
|
||||
|
||||
nb_unmap.iova = dma->iova;
|
||||
nb_unmap.size = dma->size;
|
||||
|
||||
/*
|
||||
* Notify anyone (mdev vendor drivers) to invalidate and
|
||||
* unmap iovas within the range we're about to unmap.
|
||||
* Vendor drivers MUST unpin pages in response to an
|
||||
* invalidation.
|
||||
*/
|
||||
mutex_unlock(&iommu->lock);
|
||||
blocking_notifier_call_chain(&iommu->notifier,
|
||||
VFIO_IOMMU_NOTIFY_DMA_UNMAP,
|
||||
&nb_unmap);
|
||||
goto again;
|
||||
}
|
||||
unmapped += dma->size;
|
||||
vfio_remove_dma(iommu, dma);
|
||||
}
|
||||
|
@ -1419,6 +1448,7 @@ static void *vfio_iommu_type1_open(unsigned long arg)
|
|||
INIT_LIST_HEAD(&iommu->domain_list);
|
||||
iommu->dma_list = RB_ROOT;
|
||||
mutex_init(&iommu->lock);
|
||||
BLOCKING_INIT_NOTIFIER_HEAD(&iommu->notifier);
|
||||
|
||||
return iommu;
|
||||
}
|
||||
|
@ -1553,6 +1583,22 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
|
|||
return -ENOTTY;
|
||||
}
|
||||
|
||||
static int vfio_iommu_type1_register_notifier(void *iommu_data,
|
||||
struct notifier_block *nb)
|
||||
{
|
||||
struct vfio_iommu *iommu = iommu_data;
|
||||
|
||||
return blocking_notifier_chain_register(&iommu->notifier, nb);
|
||||
}
|
||||
|
||||
static int vfio_iommu_type1_unregister_notifier(void *iommu_data,
|
||||
struct notifier_block *nb)
|
||||
{
|
||||
struct vfio_iommu *iommu = iommu_data;
|
||||
|
||||
return blocking_notifier_chain_unregister(&iommu->notifier, nb);
|
||||
}
|
||||
|
||||
static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
|
||||
.name = "vfio-iommu-type1",
|
||||
.owner = THIS_MODULE,
|
||||
|
@ -1563,6 +1609,8 @@ static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
|
|||
.detach_group = vfio_iommu_type1_detach_group,
|
||||
.pin_pages = vfio_iommu_type1_pin_pages,
|
||||
.unpin_pages = vfio_iommu_type1_unpin_pages,
|
||||
.register_notifier = vfio_iommu_type1_register_notifier,
|
||||
.unregister_notifier = vfio_iommu_type1_unregister_notifier,
|
||||
};
|
||||
|
||||
static int __init vfio_iommu_type1_init(void)
|
||||
|
|
|
@ -80,6 +80,10 @@ struct vfio_iommu_driver_ops {
|
|||
unsigned long *phys_pfn);
|
||||
int (*unpin_pages)(void *iommu_data,
|
||||
unsigned long *user_pfn, int npage);
|
||||
int (*register_notifier)(void *iommu_data,
|
||||
struct notifier_block *nb);
|
||||
int (*unregister_notifier)(void *iommu_data,
|
||||
struct notifier_block *nb);
|
||||
};
|
||||
|
||||
extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
|
||||
|
@ -103,6 +107,14 @@ extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
|
|||
extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
|
||||
int npage);
|
||||
|
||||
#define VFIO_IOMMU_NOTIFY_DMA_UNMAP (1)
|
||||
|
||||
extern int vfio_register_notifier(struct device *dev,
|
||||
struct notifier_block *nb);
|
||||
|
||||
extern int vfio_unregister_notifier(struct device *dev,
|
||||
struct notifier_block *nb);
|
||||
|
||||
/*
|
||||
* Sub-module helpers
|
||||
*/
|
||||
|
|
Loading…
Reference in a new issue