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vfio iommu: Added pin and unpin callback functions to vfio_iommu_driver_ops

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Added APIs for pining and unpining set of pages. These call back into
backend iommu module to actually pin and unpin pages.
Added two new callback functions to struct vfio_iommu_driver_ops. Backend
IOMMU module that supports pining and unpinning pages for mdev devices
should provide these functions.

Renamed static functions in vfio_type1_iommu.c to resolve conflicts

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2016-11-17 02:16:17 +05:30 committed by Alex Williamson
parent 32f55d835b
commit 2169037dc3
3 changed files with 124 additions and 11 deletions
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102
drivers/vfio/vfio.c
View File

@ -1799,6 +1799,108 @@ void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset)
}
EXPORT_SYMBOL_GPL(vfio_info_cap_shift);
/*
* Pin a set of guest PFNs and return their associated host PFNs for local
* domain only.
* @dev [in] : device
* @user_pfn [in]: array of user/guest PFNs to be unpinned.
* @npage [in] : count of elements in user_pfn array. This count should not
* be greater VFIO_PIN_PAGES_MAX_ENTRIES.
* @prot [in] : protection flags
* @phys_pfn[out]: array of host PFNs
* Return error or number of pages pinned.
*/
int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, int npage,
int prot, unsigned long *phys_pfn)
{
struct vfio_container *container;
struct vfio_group *group;
struct vfio_iommu_driver *driver;
int ret;
if (!dev || !user_pfn || !phys_pfn || !npage)
return -EINVAL;
if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
return -E2BIG;
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_pin_pages;
container = group->container;
down_read(&container->group_lock);
driver = container->iommu_driver;
if (likely(driver && driver->ops->pin_pages))
ret = driver->ops->pin_pages(container->iommu_data, user_pfn,
npage, prot, phys_pfn);
else
ret = -ENOTTY;
up_read(&container->group_lock);
vfio_group_try_dissolve_container(group);
err_pin_pages:
vfio_group_put(group);
return ret;
}
EXPORT_SYMBOL(vfio_pin_pages);
/*
* Unpin set of host PFNs for local domain only.
* @dev [in] : device
* @user_pfn [in]: array of user/guest PFNs to be unpinned. Number of user/guest
* PFNs should not be greater than VFIO_PIN_PAGES_MAX_ENTRIES.
* @npage [in] : count of elements in user_pfn array. This count should not
* be greater than VFIO_PIN_PAGES_MAX_ENTRIES.
* Return error or number of pages unpinned.
*/
int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage)
{
struct vfio_container *container;
struct vfio_group *group;
struct vfio_iommu_driver *driver;
int ret;
if (!dev || !user_pfn || !npage)
return -EINVAL;
if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
return -E2BIG;
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_unpin_pages;
container = group->container;
down_read(&container->group_lock);
driver = container->iommu_driver;
if (likely(driver && driver->ops->unpin_pages))
ret = driver->ops->unpin_pages(container->iommu_data, user_pfn,
npage);
else
ret = -ENOTTY;
up_read(&container->group_lock);
vfio_group_try_dissolve_container(group);
err_unpin_pages:
vfio_group_put(group);
return ret;
}
EXPORT_SYMBOL(vfio_unpin_pages);
/**
* Module/class support
*/

20
drivers/vfio/vfio_iommu_type1.c
View File

@ -259,8 +259,8 @@ static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
* the iommu can only map chunks of consecutive pfns anyway, so get the
* first page and all consecutive pages with the same locking.
*/
static long vfio_pin_pages(unsigned long vaddr, long npage,
int prot, unsigned long *pfn_base)
static long vfio_pin_pages_remote(unsigned long vaddr, long npage,
int prot, unsigned long *pfn_base)
{
unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
bool lock_cap = capable(CAP_IPC_LOCK);
@ -318,8 +318,8 @@ static long vfio_pin_pages(unsigned long vaddr, long npage,
return i;
}
static long vfio_unpin_pages(unsigned long pfn, long npage,
int prot, bool do_accounting)
static long vfio_unpin_pages_remote(unsigned long pfn, long npage,
int prot, bool do_accounting)
{
unsigned long unlocked = 0;
long i;
@ -382,9 +382,9 @@ static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma)
if (WARN_ON(!unmapped))
break;
unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT,
unmapped >> PAGE_SHIFT,
dma->prot, false);
unlocked += vfio_unpin_pages_remote(phys >> PAGE_SHIFT,
unmapped >> PAGE_SHIFT,
dma->prot, false);
iova += unmapped;
cond_resched();
@ -613,8 +613,8 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
while (size) {
/* Pin a contiguous chunk of memory */
npage = vfio_pin_pages(vaddr + dma->size,
size >> PAGE_SHIFT, prot, &pfn);
npage = vfio_pin_pages_remote(vaddr + dma->size,
size >> PAGE_SHIFT, prot, &pfn);
if (npage <= 0) {
WARN_ON(!npage);
ret = (int)npage;
@ -624,7 +624,7 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
/* Map it! */
ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, prot);
if (ret) {
vfio_unpin_pages(pfn, npage, prot, true);
vfio_unpin_pages_remote(pfn, npage, prot, true);
break;
}

13
include/linux/vfio.h
View File

@ -75,7 +75,11 @@ struct vfio_iommu_driver_ops {
struct iommu_group *group);
void (*detach_group)(void *iommu_data,
struct iommu_group *group);
int (*pin_pages)(void *iommu_data, unsigned long *user_pfn,
int npage, int prot,
unsigned long *phys_pfn);
int (*unpin_pages)(void *iommu_data,
unsigned long *user_pfn, int npage);
};
extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
@ -92,6 +96,13 @@ extern int vfio_external_user_iommu_id(struct vfio_group *group);
extern long vfio_external_check_extension(struct vfio_group *group,
unsigned long arg);
#define VFIO_PIN_PAGES_MAX_ENTRIES (PAGE_SIZE/sizeof(unsigned long))
extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
int npage, int prot, unsigned long *phys_pfn);
extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
int npage);
/*
* Sub-module helpers
*/