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vfio iommu type1: Add find_iommu_group() function 

Add find_iommu_group()

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Reviewed-by: Jike Song <jike.song@intel.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 02:16:20 +05:30 committed by Alex Williamson
parent ea85cf353e
commit 7896c998f0
1 changed files with 33 additions and 24 deletions
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57
drivers/vfio/vfio_iommu_type1.c
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@ -752,11 +752,24 @@ static void vfio_test_domain_fgsp(struct vfio_domain *domain)
__free_pages(pages, order); __free_pages(pages, order);
} }
static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
struct iommu_group *iommu_group)
{
struct vfio_group *g;
list_for_each_entry(g, &domain->group_list, next) {
if (g->iommu_group == iommu_group)
return g;
}
return NULL;
}
static int vfio_iommu_type1_attach_group(void *iommu_data, static int vfio_iommu_type1_attach_group(void *iommu_data,
struct iommu_group *iommu_group) struct iommu_group *iommu_group)
{ {
struct vfio_iommu *iommu = iommu_data; struct vfio_iommu *iommu = iommu_data;
struct vfio_group *group, *g; struct vfio_group *group;
struct vfio_domain *domain, *d; struct vfio_domain *domain, *d;
struct bus_type *bus = NULL; struct bus_type *bus = NULL;
int ret; int ret;
@ -764,10 +777,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
mutex_lock(&iommu->lock); mutex_lock(&iommu->lock);
list_for_each_entry(d, &iommu->domain_list, next) { list_for_each_entry(d, &iommu->domain_list, next) {
list_for_each_entry(g, &d->group_list, next) { if (find_iommu_group(d, iommu_group)) {
if (g->iommu_group != iommu_group)
continue;
mutex_unlock(&iommu->lock); mutex_unlock(&iommu->lock);
return -EINVAL; return -EINVAL;
} }
@ -887,27 +897,26 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
mutex_lock(&iommu->lock); mutex_lock(&iommu->lock);
list_for_each_entry(domain, &iommu->domain_list, next) { list_for_each_entry(domain, &iommu->domain_list, next) {
list_for_each_entry(group, &domain->group_list, next) { group = find_iommu_group(domain, iommu_group);
if (group->iommu_group != iommu_group) if (!group)
continue; continue;
iommu_detach_group(domain->domain, iommu_group); iommu_detach_group(domain->domain, iommu_group);
list_del(&group->next); list_del(&group->next);
kfree(group); kfree(group);
/* /*
* Group ownership provides privilege, if the group * Group ownership provides privilege, if the group
* list is empty, the domain goes away. If it's the * list is empty, the domain goes away. If it's the
* last domain, then all the mappings go away too. * last domain, then all the mappings go away too.
*/ */
if (list_empty(&domain->group_list)) { if (list_empty(&domain->group_list)) {
if (list_is_singular(&iommu->domain_list)) if (list_is_singular(&iommu->domain_list))
vfio_iommu_unmap_unpin_all(iommu); vfio_iommu_unmap_unpin_all(iommu);
iommu_domain_free(domain->domain); iommu_domain_free(domain->domain);
list_del(&domain->next); list_del(&domain->next);
kfree(domain); kfree(domain);
}
goto done;
} }
goto done;
} }
done: done: