Commit 5d704992 authored by Eric Auger's avatar Eric Auger Committed by Will Deacon

vfio/type1: Allow transparent MSI IOVA allocation

When attaching a group to the container, check the group's
reserved regions and test whether the IOMMU translates MSI
transactions. If yes, we initialize an IOVA allocator through
the iommu_get_msi_cookie API. This will allow the MSI IOVAs
to be transparently allocated on MSI controller's compose().
Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Reviewed-by: default avatarTomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: default avatarTomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: default avatarBharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 59768527
......@@ -39,6 +39,7 @@
#include <linux/pid_namespace.h>
#include <linux/mdev.h>
#include <linux/notifier.h>
#include <linux/dma-iommu.h>
#define DRIVER_VERSION "0.2"
#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
......@@ -1181,6 +1182,28 @@ static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
return NULL;
}
static bool vfio_iommu_has_resv_msi(struct iommu_group *group,
phys_addr_t *base)
{
struct list_head group_resv_regions;
struct iommu_resv_region *region, *next;
bool ret = false;
INIT_LIST_HEAD(&group_resv_regions);
iommu_get_group_resv_regions(group, &group_resv_regions);
list_for_each_entry(region, &group_resv_regions, list) {
if (region->type & IOMMU_RESV_MSI) {
*base = region->start;
ret = true;
goto out;
}
}
out:
list_for_each_entry_safe(region, next, &group_resv_regions, list)
kfree(region);
return ret;
}
static int vfio_iommu_type1_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
......@@ -1189,6 +1212,8 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
struct vfio_domain *domain, *d;
struct bus_type *bus = NULL, *mdev_bus;
int ret;
bool resv_msi;
phys_addr_t resv_msi_base;
mutex_lock(&iommu->lock);
......@@ -1258,6 +1283,8 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (ret)
goto out_domain;
resv_msi = vfio_iommu_has_resv_msi(iommu_group, &resv_msi_base);
INIT_LIST_HEAD(&domain->group_list);
list_add(&group->next, &domain->group_list);
......@@ -1304,6 +1331,9 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (ret)
goto out_detach;
if (resv_msi && iommu_get_msi_cookie(domain->domain, resv_msi_base))
goto out_detach;
list_add(&domain->next, &iommu->domain_list);
mutex_unlock(&iommu->lock);
......
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