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

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

drivers/vfio/vfio_iommu_type1.c

+30 −0
Original line number Diff line number Diff line
@@ -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);